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Ferrer MB, Harada D, Martin CJ, Métivier R, Allain C, Nakatani K, Louis M, Kawaguchi N, Yanagida T, Yasuhara K, Kawai T. Cascade Fluorescence Modulation in Photochromic Microcapsules. ACS APPLIED MATERIALS & INTERFACES 2024. [PMID: 39319449 DOI: 10.1021/acsami.4c09023] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 09/26/2024]
Abstract
Certain derivatives of terarylene are able to undergo a highly efficient oxidative cycloreversion cascade effect, a ring opening reaction with quantum yields above unity, resulting in a colored-to-colorless transition in solution. In the presence of chloroform, high-energy UV and X-rays can trigger this phenomenon, potentially acting as a visual detection system for ionizing radiation. However, chloroform is sensitive to different irradiation wavelengths without distinction, making it difficult to adapt to a reusable device. Chlorobenzene was chosen as an alternative halogenated solvent, as it offers wavelength selectivity between photocyclization and cascade effect cycloreversion. Nile Red was also incorporated into the system with the aim of improving the sensitivity of the visual detection via fluorescence photoswitching. Finally, microencapsulation of both terarylene and Nile Red was targeted to obtain both the cascade effect and photoswitching in a single system. In microcapsules made from a Pickering emulsion, this terarylene-Nile Red system showed high fatigue resistance to repeated photocyclization and cycloreversion irradiation, giving access to repeated ON/OFF fluorescence photoswitching. The cascade effect was also successfully demonstrated along with fluorescence recovery, showing the versatility of the two phenomena in different media.
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Affiliation(s)
- Magin Benedict Ferrer
- Graduate School of Science and Technology, Nara Institute of Science and Technology, NAIST, 8916-5 Takayama-cho, Ikoma, Nara 630-0192, Japan
- Université Paris-Saclay, ENS Paris-Saclay, CNRS, PPSM, Gif-sur-Yvette 91190, France
| | - Daiyu Harada
- Graduate School of Science and Technology, Nara Institute of Science and Technology, NAIST, 8916-5 Takayama-cho, Ikoma, Nara 630-0192, Japan
| | - Colin J Martin
- Graduate School of Science and Technology, Nara Institute of Science and Technology, NAIST, 8916-5 Takayama-cho, Ikoma, Nara 630-0192, Japan
| | - Rémi Métivier
- Université Paris-Saclay, ENS Paris-Saclay, CNRS, PPSM, Gif-sur-Yvette 91190, France
| | - Clémence Allain
- Université Paris-Saclay, ENS Paris-Saclay, CNRS, PPSM, Gif-sur-Yvette 91190, France
| | - Keitaro Nakatani
- Université Paris-Saclay, ENS Paris-Saclay, CNRS, PPSM, Gif-sur-Yvette 91190, France
| | - Marine Louis
- Graduate School of Science and Technology, Nara Institute of Science and Technology, NAIST, 8916-5 Takayama-cho, Ikoma, Nara 630-0192, Japan
| | - Noriaki Kawaguchi
- Graduate School of Science and Technology, Nara Institute of Science and Technology, NAIST, 8916-5 Takayama-cho, Ikoma, Nara 630-0192, Japan
| | - Takayuki Yanagida
- Graduate School of Science and Technology, Nara Institute of Science and Technology, NAIST, 8916-5 Takayama-cho, Ikoma, Nara 630-0192, Japan
| | - Kazuma Yasuhara
- Graduate School of Science and Technology, Nara Institute of Science and Technology, NAIST, 8916-5 Takayama-cho, Ikoma, Nara 630-0192, Japan
| | - Tsuyoshi Kawai
- Graduate School of Science and Technology, Nara Institute of Science and Technology, NAIST, 8916-5 Takayama-cho, Ikoma, Nara 630-0192, Japan
- Medilux Resaerch Center, Nara Institute of Science and Technology, NAIST, 8916-5 Takayama-cho, Ikoma, Nara 630-0192, Japan
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2
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Montereali RM, Nigro V, Piccinini M, Vincenti MA, Nenzi P, Ronsivalle C, Nichelatti E. Visible proton Bragg curve imaging by colour centre photoluminescence in radiation detectors based on lithium fluoride films on silica. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2024; 36:215703. [PMID: 38364273 DOI: 10.1088/1361-648x/ad2a08] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/30/2023] [Accepted: 02/16/2024] [Indexed: 02/18/2024]
Abstract
Passive solid-state radiation detectors, based on the visible photoluminescence (PL) of radiation-induced colour centres in optically transparent lithium fluoride (LiF), polycrystalline thin films are under investigation for proton beam advanced diagnostics. After proton exposure, the latent images stored in LiF as local formations of stable F2and F3+aggregate defects, are directly read with a fluorescence microscope under illumination in the blue spectral range. Adopting a suitable irradiation geometry, the energy density that protons deposit in the material can be recorded as a spatial distribution of these light-emitting defects, from which a luminous replica of the proton Bragg curve can be thereafter extracted and analysed to reconstruct the proton beam energy spectrum. Their peculiar properties, such as wide dynamic range and linearity of the spectrally-integrated PL response vs. dose, make the investigation of two-dimensional LiF film radiation detectors grown on several types of substrate highly attractive. Here, the case of a LiF thin film thermally evaporated on a silica substrate, irradiated at grazing incidence with a 35 MeV proton beam, is investigated and reported for the first time. A comparison of the measured photoluminescent Bragg curve with Monte Carlo simulations demonstrates that the Bragg peak in the film is located at the very same position that would be expected in the underlying silica substrate rather than in LiF. The film packing density is shown not to have a significant effect on the peak depth, while even small nonzero grazing angle of the impinging proton beam is able to significantly modify the shape of the Bragg curve. These findings are ascribed to the effects of multiple Coulomb scattering in both the film and the substrate and are interesting for proton beam diagnostics and dosimetry.
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Affiliation(s)
- R M Montereali
- ENEA C.R. Frascati, Fusion and Technologies for Nuclear Safety and Security Department, Via E. Fermi 45, 00044 Frascati (Rome), Italy
| | - V Nigro
- ENEA C.R. Frascati, Fusion and Technologies for Nuclear Safety and Security Department, Via E. Fermi 45, 00044 Frascati (Rome), Italy
| | - M Piccinini
- ENEA C.R. Frascati, Fusion and Technologies for Nuclear Safety and Security Department, Via E. Fermi 45, 00044 Frascati (Rome), Italy
| | - M A Vincenti
- ENEA C.R. Frascati, Fusion and Technologies for Nuclear Safety and Security Department, Via E. Fermi 45, 00044 Frascati (Rome), Italy
| | - P Nenzi
- ENEA C.R. Frascati, Fusion and Technologies for Nuclear Safety and Security Department, Via E. Fermi 45, 00044 Frascati (Rome), Italy
| | - C Ronsivalle
- ENEA C.R. Frascati, Fusion and Technologies for Nuclear Safety and Security Department, Via E. Fermi 45, 00044 Frascati (Rome), Italy
| | - E Nichelatti
- ENEA C.R. Casaccia, Fusion and Technologies for Nuclear Safety and Security Department, Via Anguillarese 301, 00123 S. Maria di Galeria (Rome), Italy
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Mishev AL, Kodaira S, Kitamura H, Ploc O, Ambrožová I, Tolochek RV, Kartsev IS, Shurshakov VA, Artamonov AA, Inozemtsev KO. Radiation environment in high-altitude Antarctic plateau: Recent measurements and model studies. THE SCIENCE OF THE TOTAL ENVIRONMENT 2023; 890:164304. [PMID: 37230348 DOI: 10.1016/j.scitotenv.2023.164304] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/17/2023] [Revised: 05/03/2023] [Accepted: 05/16/2023] [Indexed: 05/27/2023]
Abstract
Polar regions are the most exposed to secondary particles and radiation produced by primary cosmic rays in the atmosphere, because naturally they are with marginal geomagnetic shielding. In addition, the secondary particle flux contributing to the complex radiation field is enhanced at high-mountain altitudes compared to sea level because of the reduced atmospheric attenuation. At present, there are very few systematic experimental measurements of environmental dose at high southern latitudes, specifically at high-altitude region. Here, we report a campaign of measurements with different devices, that is passive and Liulin-type dosimeters, of the radiation background at high-mountain Antarctic station Vostok (3488 m above sea level, 78° 27' S; 106° 50' E). We compare the measurements with a Monte Carlo-based model for the propagation of the cosmic rays through the atmosphere and assessment of the radiation field in the atmosphere. We employed the model to estimate the radiation dose at Vostok station during the ground-level enhancement at 28 October 2021. As in previous studies by other teams, we show that the annual dose equivalent at high-altitude Antarctic facilities can significantly exceed the limit of 1 mSv established for the general population by the ICRP.
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Affiliation(s)
- A L Mishev
- Space Physics and Astronomy Research Unit, University of Oulu, Finland; Sodankylä Geophysical Observatory, University of Oulu, Finland.
| | - S Kodaira
- Radiation Measurement Research Group, National Institutes for Quantum Science and Technology, 4-9-1 Anagawa, Inage, Chiba 263-8555, Japan
| | - H Kitamura
- Radiation Measurement Research Group, National Institutes for Quantum Science and Technology, 4-9-1 Anagawa, Inage, Chiba 263-8555, Japan
| | - O Ploc
- Nuclear Physics Institute of the Czech Academy of Sciences, Hlavní 130, Řež 250 68, Czech Republic
| | - I Ambrožová
- Nuclear Physics Institute of the Czech Academy of Sciences, Hlavní 130, Řež 250 68, Czech Republic
| | - R V Tolochek
- Institute of Biomedical Problems of the Russian Academy of Sciences (IBMP RAS), 76A Khoroshevskoye shosse, Moscow 123007, Russian Federation; P.N.Lebedev Physical Institute of the Russian Academy of Sciences (LPI RAS), 53 Leninskiy Prospekt, Moscow 119991, Russian Federation
| | - I S Kartsev
- Institute of Biomedical Problems of the Russian Academy of Sciences (IBMP RAS), 76A Khoroshevskoye shosse, Moscow 123007, Russian Federation; LLC "SNIIP-Plus", 5(1) Raspletina, Moscow 123060, Russian Federation
| | - V A Shurshakov
- Institute of Biomedical Problems of the Russian Academy of Sciences (IBMP RAS), 76A Khoroshevskoye shosse, Moscow 123007, Russian Federation
| | - A A Artamonov
- Institute of Biomedical Problems of the Russian Academy of Sciences (IBMP RAS), 76A Khoroshevskoye shosse, Moscow 123007, Russian Federation
| | - K O Inozemtsev
- Institute of Biomedical Problems of the Russian Academy of Sciences (IBMP RAS), 76A Khoroshevskoye shosse, Moscow 123007, Russian Federation
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Golovko VV, Kamaev O, Sun J, Jillings CJ, Gorel P, Vázquez-Jáuregui E. Ambient Dose and Dose Rate Measurement in SNOLAB Underground Laboratory at Sudbury, Ontario, Canada. SENSORS (BASEL, SWITZERLAND) 2023; 23:1945. [PMID: 36850546 PMCID: PMC9962506 DOI: 10.3390/s23041945] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 12/12/2022] [Revised: 01/19/2023] [Accepted: 01/31/2023] [Indexed: 06/18/2023]
Abstract
The paper describes a system and experimental procedure that use integrating passive detectors, such as thermoluminescent dosimeters (TLDs), for the measurement of ultra-low-level ambient dose equivalent rate values at the underground SNOLAB facility located in Sudbury, Ontario, Canada. Because these detectors are passive and can be exposed for relatively long periods of time, they can provide better sensitivity for measuring ultra-low activity levels. The final characterization of ultra-low-level ambient dose around water shielding for ongoing direct dark matter search experiments in Cube Hall at SNOLAB underground laboratory is given. The conclusion is that TLDs provide reliable results in the measurement of the ultra-low-level environmental radiation background.
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Affiliation(s)
- Victor V. Golovko
- Canadian Nuclear Laboratories, 286 Plant Road, Chalk River, ON K0J 1J0, Canada
| | - Oleg Kamaev
- Canadian Nuclear Laboratories, 286 Plant Road, Chalk River, ON K0J 1J0, Canada
| | - Jiansheng Sun
- Canadian Nuclear Laboratories, 286 Plant Road, Chalk River, ON K0J 1J0, Canada
| | | | | | - Eric Vázquez-Jáuregui
- Instituto de Física, Universidad Nacional Autónoma de México, A. P. 20-364, Mexico City 01000, Mexico
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5
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Gómez-Ros J, Bedogni R, Domingo C. Personal neutron dosimetry: State-of-the-art and new technologies. RADIAT MEAS 2023. [DOI: 10.1016/j.radmeas.2023.106908] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
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6
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Vanhavere F, Van Hoey O. Advances in personal dosimetry towards real-time dosimetry. RADIAT MEAS 2022. [DOI: 10.1016/j.radmeas.2022.106862] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/31/2022]
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7
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Gasparian PBG, Malthez ALMC, Campos LL. Using the optically stimulated luminescence technique for one- and two-dimensional dose mapping: a brief review. Phys Med Biol 2022; 67. [DOI: 10.1088/1361-6560/ac9030] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/11/2022] [Accepted: 09/07/2022] [Indexed: 11/12/2022]
Abstract
Abstract
In respect of radiation dosimetry, several applications require dose distribution verification rather than absolute dosimetry. Most protocols use radiological and radiochromic films and ionization chambers or diode arrays for dose mapping. The films are disposable which causes the precision of the results dependent on film production variability. The measurements with arrays of ionization chambers or diodes mainly lack spatial resolution. This review aims to provide an overview of the use of optically stimulated luminescence detectors (OSLDs) for one-dimensional (1D) and two-dimensional (2D) dose mapping in different applications. It reviews the ideas, OSL materials, and applications related to the assessment of dose distribution using OSLDs in the form of film or ceramic plate (BeO). Additionally, it reviews research published in the international scientific literature from 1998 to 2021. As an outcome, a table containing the main characteristics of each relevant paper is shown. The results section was divided by the type of OSL material, and we briefly described the principal findings and the significant developments of each mentioned study such as film production and OSL reader assembly. The purpose of this study was to present an overview of the main findings of several research groups on the use of OSLD in the form of film or plate for 1D and 2D dose mapping. Finally, the potential future development of dose mapping using OSLD films was outlined.
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Contassot R, Batista J, Otsuka A, Souza A, Ferraz E, Souza AS, Santos JLO, Coelho V, Lima H. Elucidating the effect of intrinsic defects on the dosimetric properties of the MgB 4O 7 compound: an atomistic simulation approach. NEW J CHEM 2022. [DOI: 10.1039/d1nj06080e] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
We have elucidated the origin of natural defects on MgB4O7 and associated them with dosimetric characteristics.
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Affiliation(s)
- Raíssa Contassot
- Departamento de Ciências Exatas e Sociais Aplicadas, Universidade Federal de Ciências da Saúde de Porto Alegre, 40050-170, Porto Alegre, RS, Brazil
| | - João Batista
- Departamento de Ciências Exatas e Sociais Aplicadas, Universidade Federal de Ciências da Saúde de Porto Alegre, 40050-170, Porto Alegre, RS, Brazil
| | - André Otsuka
- Departamento de Física, Universidade Federal de Sergipe, 49100-000, São Cristóvão, SE, Brazil
| | - Antônio Souza
- Centro das Ciências Exatas e das Tecnologias, Universidade Federal do Oeste da Bahia, 47808-021, Barreiras, BA, Brazil
| | - Edward Ferraz
- Centro das Ciências Exatas e das Tecnologias, Universidade Federal do Oeste da Bahia, 47808-021, Barreiras, BA, Brazil
| | - Adelmo S. Souza
- Centro Multidisciplinar de Bom Jesus da Lapa, Universidade Federal do Oeste da Bahia, 47600-000, Bom Jesus da Lapa, BA, Brazil
| | - Jorge L. O. Santos
- Centro Multidisciplinar de Bom Jesus da Lapa, Universidade Federal do Oeste da Bahia, 47600-000, Bom Jesus da Lapa, BA, Brazil
| | - Vinicius Coelho
- Centro Multidisciplinar de Bom Jesus da Lapa, Universidade Federal do Oeste da Bahia, 47600-000, Bom Jesus da Lapa, BA, Brazil
| | - Heveson Lima
- Centro Multidisciplinar de Luís Eduardo Magalhães, Universidade Federal do Oeste da Bahia, 47850-000, Luís Eduardo Magalhães, BA, Brazil
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9
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Asfora VK, Antonio PL, Gonçalves JA, Bueno CC, de Barros VS, Oliveira CN, Caldas LV, Khoury HJ. Evaluation of TL and OSL responses of CaF2:Tm for electron beam processing dosimetry. RADIAT MEAS 2021. [DOI: 10.1016/j.radmeas.2020.106512] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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10
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Medeiros MTS, Barros VS, Asfora VK, Khoury HJ, d’Errico F. Infrared optically stimulated luminescence of rare earth doped CaF2 and co-doped with Al or Li produced by combustion synthesis. RADIAT MEAS 2020. [DOI: 10.1016/j.radmeas.2020.106366] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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11
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Mandlik NT, Sahare PD, Kulkarni MS, Rawat NS, Gaikwad NP, Dhole SD. Study of optically stimulated luminescence and calculation of trapping parameters of K 2Ca 2(SO 4) 3:Eu nanophosphor. Appl Radiat Isot 2020; 167:109388. [PMID: 33011514 DOI: 10.1016/j.apradiso.2020.109388] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/08/2020] [Revised: 08/14/2020] [Accepted: 08/17/2020] [Indexed: 12/01/2022]
Abstract
K2Ca2(SO4)3:Eu nanophosphor was synthesized by chemical coprecipitation method and annealed at different temperatures from 400 to 900 °C. The nanophosphor annealed at 600 °C showed cubic structure with crystallite size ~25 nm. TEM shows morphology of K2Ca2(SO4)3:Eu nanophosphor was in the form of nanorods having diameter ~20 nm and length of ~100-200 nm. These samples were irradiated with gamma radiation for the doses varying from 10 mGy to 10 kGy and their Thermoluminescence (TL) and continuous-wave optically stimulated luminescence (CW-OSL) have been studied. CW-OSL response was found to be maximal for the sample annealed at 600 °C. The TL glow curve of the nanophosphor apparently showed a major peak at around 160 °C accompanied by three low intensity peaks at ~75, 215 and 285 °C. The traps responsible for all the TL peaks in K2Ca2(SO4)3:Eu were also found to be OSL sensitive. The qualitative correlation between TL peaks and CW-OSL response suggested that the traps associated with low temperature peaks are responsible for fast decay and the traps associated with the higher temperature peaks are responsible for slow decay of the OSL signal. OSL response showed linear behavior up to 1 kGy and saturated with further increase in the gamma dose. The wide OSL response makes studied K2Ca2(SO4)3:Eu nanophosphor a good candidate for high dose measurement.
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Affiliation(s)
- Nandkumar T Mandlik
- Department of Physics, Fergusson College, Savitribai Phule Pune University, Pune, 411004, Maharashtra, India.
| | - P D Sahare
- Department of Physics and Astrophysics, University of Delhi, Delhi, 110007, India.
| | - M S Kulkarni
- Health Physics Division, BARC, Mumbai, 400085, Maharashtra, India
| | - N S Rawat
- Radiological Physics and Advisory Division, BARC, Mumbai, 400 085, Maharashtra, India
| | - N P Gaikwad
- Radiological Physics and Advisory Division, BARC, Mumbai, 400 085, Maharashtra, India
| | - S D Dhole
- Department of Physics, Savitribai Phule Pune University, Pune, 411007, Maharashtra, India
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Majewska N, Leśniewski T, Mahlik S, Grinberg M, Chruścińska A, Michalik D, Sopicka-Lizer M. Study of persistent luminescence and thermoluminescence in SrSi 2N 2O 2:Eu 2+,M 3+ (M = Ce, Dy, and Nd). Phys Chem Chem Phys 2020; 22:17152-17159. [PMID: 32692338 DOI: 10.1039/d0cp01739f] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
The process of persistent luminescence or glow-in-the-dark, the delayed emission of light of irradiated substances, has long fascinated researchers, who have made efforts to explain the underlying physical phenomenon as well as put it to practical use. However, persistent luminescence is an elusive and difficult process, both in terms of controlling or altering its properties, as well as providing a quantitative description. In this paper, we used SrSi2N2O2:Eu2+ as a model persistent phosphor, characterized by the broad distribution of structural defects and exhibiting long-lasting Eu2+ luminescence that is visible for a few minutes after switching off UV light. We investigated the persistent luminescence process by two complementary methods, namely, thermoluminescence and temperature-dependent persistent luminescence decay measurements. Analysis of experimental data allowed us to determine the depth distribution of traps, and allowed us to distinguish two different mechanisms by which the emission is delayed. The first, the temperature-dependent mechanism, is related to trap activation, while the second, temperature-independent mechanism is related to carrier migration. Finally, we employed the strategy of the co-doping of the phosphor SrSi2N2O2:Eu2+,M3+ (M = Ce, Nd, Dy) to modify the persistent luminescence properties.
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Affiliation(s)
- Natalia Majewska
- Institute of Experimental Physics, Faculty of Mathematics, Physics and Informatics, University of Gdansk, Wita Stwosza 57, 80-308 Gdansk, Poland.
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13
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A novel extrapolation method using OSL detectors for very small field output factor measurement for stereotactic radiosurgery. Phys Eng Sci Med 2020; 43:593-599. [DOI: 10.1007/s13246-020-00859-2] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/06/2019] [Accepted: 03/10/2020] [Indexed: 11/26/2022]
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14
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Zhuang AH, Olch AJ. A practical method for the reuse of nanoDot OSLDs and predicting sensitivities up to at least 7000 cGy. Med Phys 2020; 47:1481-1488. [PMID: 32009242 DOI: 10.1002/mp.14059] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/13/2019] [Revised: 01/16/2020] [Accepted: 01/17/2020] [Indexed: 11/06/2022] Open
Abstract
PURPOSE Optically stimulated luminescence dosimeter (OSLDs) are often used to make in vivo dose measurements. Most users calibrate the OSLDs using the software provided by the vendor which typically is intended for doses up to about 300 cGy with an uncertainty of ±5.5%. OSLDs that reach that dose are then discarded, and new ones are purchased and calibrated. A method has been developed for reusing OSLDs and predicting dose sensitivity up to at least 7000 cGy. MATERIALS AND METHODS The nanoDot OSLDs used in this study were routinely used to do in vivo measurements for TBI patients. Instead of using the calibration program provided by the vendor, each nanoDot was bleached to about 100 counts (~0.1 cGy), then calibrated with 50 cGy to produce a sensitivity specific to each nanoDot prior to the patient measurement. NanoDots were read in the hardware mode and the sensitivity factor was applied manually to subsequent patient in-vivo TBI measurements. This was followed by bleaching prior to the next use. The changes of nanoDot sensitivity relative to accumulated dose were analyzed among nine nanoDots. In addition, a method to predict a nanoDot's sensitivity was investigated which aims to reduce the number of sensitivity calibrations while retaining dosimetric accuracy. RESULTS Individual per-use nanodot calibrations were performed up to 7000 cGy for 37 clinical TBI patients. Among the nine nanoDots analyzed in this paper, the sensitivity vs accumulated dose decreased linearly up to about 3000 cGy, with linear fitting curve R2 values above 0.93. After 3000 cGy of accumulated dose, the sensitivity started to plateau and tended to increase by 6000 cGy, with 2nd order polynomial curve R2 values above 0.94. With this finding, an efficient and accurate method to predict nanoDots' sensitivities was developed. With the method applied to the nine OSLDs, a total of 127 sensitivities were predicted and retrospectively compared with measured sensitivities. The predicted sensitivities agreed with measured sensitivities within ±4.0% with an average of -0.8%. CONCLUSIONS This study is the first to demonstrate the reuse of nanoDot OSLDs on numerous patients with accumulated dose up to 7000 cGy. Our nanoDot re-usage methodology is accurate, cost-saving and feasible. A time-saving method is also provided that allows a user to reuse a nanoDot with sensitivities predicted with better accuracy than the 5.5% value provided by the conventional batch calibration method.
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Affiliation(s)
- Audrey H Zhuang
- Department of Radiation Oncology, Keck School of Medicine, University of Southern California, Los Angeles, CA, 90033, USA
| | - Arthur J Olch
- Department of Radiation Oncology, Keck School of Medicine, University of Southern California, Los Angeles, CA, 90033, USA.,Radiation Oncology Program, Children's Hospital Los Angeles, Los Angeles, CA, 90027, USA
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15
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Wang C, Zheng Z, Zhang Y, Liu Q, Deng M, Xu X, Zhou Z, He H. Modulating trap properties by Nd 3+- Eu 3+ co-doping in Sr 2SnO 4 host for optical information storage. OPTICS EXPRESS 2020; 28:4249-4257. [PMID: 32122081 DOI: 10.1364/oe.386164] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/17/2019] [Accepted: 01/21/2020] [Indexed: 06/10/2023]
Abstract
We report a novel Nd3+ and Eu3+ co-doped Sr2SnO4 (SSONE) phosphor showing the capability of "write-in" and "read-out" in optical information storage. As-prepared phosphors exhibit a dominant emission (PL) band centered at 596 nm under UV excitation, closely identical with its photo-stimulated luminescence (PSL) spectrum center (595 nm) upon near-infrared (NIR) light and thermal-stimulated luminescence (TSL) spectrum center (595 nm) under heat source. Remarkably, compared with Eu3+ single-doped phosphors, the co-doping strategy enhances the deep traps and also separates the deep traps with shallow traps, which are very crucial factors for optical information storage in electron trapping materials. Further, a demonstration confirmed the optical information storage capacity by photo- and thermal-stimulating the prepared phosphors filled in the designed patterns.
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16
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OSL using a prototype fibre-mounted sensor and automated reader assembly. Radiat Phys Chem Oxf Engl 1993 2020. [DOI: 10.1016/j.radphyschem.2019.108464] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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17
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Wong JHD, Bakhsh M, Cheah YY, Jong WL, Khor JS, Ng KH. CHARACTERISATION AND EVALUATION OF AL2O3:C-BASED OPTICALLY STIMULATED LUMINESCENT DOSEMETER SYSTEM FOR DIAGNOSTIC X-RAYS: PERSONAL AND IN VIVO DOSIMETRY. RADIATION PROTECTION DOSIMETRY 2019; 187:451-460. [PMID: 31650160 DOI: 10.1093/rpd/ncz186] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/13/2019] [Revised: 07/22/2019] [Accepted: 07/24/2019] [Indexed: 06/10/2023]
Abstract
This study characterises and evaluates an Al2O3:C-based optically stimulated luminescent dosemeter (OSLD) system, commercially known as the nanoDot™ dosemeter and the InLight® microStar reader, for personal and in vivo dose measurements in diagnostic radiology. The system characteristics, such as dose linearity, reader accuracy, reproducibility, batch homogeneity, energy dependence and signal stability, were explored. The suitability of the nanoDot™ dosemeters was evaluated by measuring the depth dose curve, in vivo dose measurement and image perturbation. The nanoDot™ dosemeters were observed to produce a linear dose with ±2.8% coefficient variation. Significant batch inhomogeneity (8.3%) was observed. A slight energy dependence (±6.1%) was observed between 60 and 140 kVp. The InLight® microStar reader demonstrated good accuracy and a reproducibility of ±2%. The depth dose curve measured using nanoDot™ dosemeters showed slightly lower responses than Monte Carlo simulation results. The total uncertainty for a single dose measurement using this system was 11%, but it could be reduced to 9.2% when energy dependence correction was applied.
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Affiliation(s)
- J H D Wong
- Department of Biomedical Imaging, Faculty of Medicine, University of Malaya, Kuala Lumpur 50603, Malaysia
- University of Malaya Research Imaging Centre, Faculty of Medicine, University of Malaya, Kuala Lumpur 50603, Malaysia
| | - M Bakhsh
- Department of Biomedical Imaging, Faculty of Medicine, University of Malaya, Kuala Lumpur 50603, Malaysia
| | - Y Y Cheah
- Department of Biomedical Imaging, Faculty of Medicine, University of Malaya, Kuala Lumpur 50603, Malaysia
| | - W L Jong
- Clinical Oncology Unit, Faculty of Medicine, University of Malaya, Kuala Lumpur 50603, Malaysia
| | - J S Khor
- Department of Biomedical Imaging, Faculty of Medicine, University of Malaya, Kuala Lumpur 50603, Malaysia
| | - K H Ng
- Department of Biomedical Imaging, Faculty of Medicine, University of Malaya, Kuala Lumpur 50603, Malaysia
- University of Malaya Research Imaging Centre, Faculty of Medicine, University of Malaya, Kuala Lumpur 50603, Malaysia
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18
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Afterglow, TL and OSL properties of Mn 2+-doped ZnGa 2O 4 phosphor. Sci Rep 2019; 9:9544. [PMID: 31266967 PMCID: PMC6606564 DOI: 10.1038/s41598-019-45869-7] [Citation(s) in RCA: 26] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/27/2018] [Accepted: 06/13/2019] [Indexed: 11/08/2022] Open
Abstract
Zinc gallate (ZnGa2O4) spinel ceramics doped with Mn2+ ions was prepared by a solid-state reaction at 1200 °C in air. Manganese concentration was equal to 0.05 mol.% of MnO with respect to ZnO. Ceramics produced in this way show an efficient green emission at about 505 nm under UV or X-ray excitations, which is caused by Mn2+ ions. This green emission is observed also as a relatively long afterglow (visible to the naked eye in the dark for about one hour) after switching-off the X-ray excitation. Time profiles of the beginning of glow and afterglow have been studied together with thermally stimulated (TSL) and optically stimulated (OSL) luminescence. Experimental results demonstrate a presence of few types of shallow and deep traps responsible for the observed afterglow and TSL/OSL emission of the material. The possibility of pulsed optical stimulation and time-resolved OSL characteristics of ZnGa2O4: Mn2+ has been reported for the first time. The presented results suggest the ZnGa2O4: Mn2+ spinel as a promising material for further fundamental research and possibility of application as a green long-lasting phosphor or storage phosphor for TSL/OSL radiation dosimetry.
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19
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Sato F, Hashimoto T, Tamaki S, Kusaka S, Miyamaru H, Murata I. One-dimensional dose measurement with string-shaped photo-stimulated luminescence detector. RADIAT MEAS 2019. [DOI: 10.1016/j.radmeas.2019.04.013] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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20
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Obodovskiy I. Radiation Detection. RADIATION 2019. [DOI: 10.1016/b978-0-444-63979-0.00014-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022] Open
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21
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Agarwal M, Asokan K, Garg SK, Dhamija E, Kumar P. Synthesis of OSL nanophosphor Li 3B 7O 12:Mn and its dosimetric properties. JOURNAL OF RADIOLOGICAL PROTECTION : OFFICIAL JOURNAL OF THE SOCIETY FOR RADIOLOGICAL PROTECTION 2018; 38:1311-1320. [PMID: 30198859 DOI: 10.1088/1361-6498/aae002] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
The present paper reports the structural, morphological and optical properties of nanophosphor Li3B7O12:Mn with an optimised dopant concentration of 0.25 mol% and its surface modification under the irradiation of 250 keV proton beams and gamma photons for ion fluence ranging from 1 × 1013 to 6.25 × 1015 ions cm-2 and doses from 100 mGy-100 Gy, respectively. This nanophosphor has been synthesised by the high temperature solid state reaction method. Its optical properties are characterised by optically stimulated luminescence (OSL) and thermo luminescence (TL) techniques. This nanophosphor is polycrystalline in nature with a grain size of 40-80 nm confirmed by x-ray diffraction (XRD) and transmission electron microscopy (TEM). The OSL decay and TL glow curve response of the proton beam irradiated samples exhibit significant intensity at a fluence of 2.5 × 1014 ions cm-2. Moreover, Li3B7O12:Mn displays a linear response for gamma doses in the range of 100 mGy-50 Gy. We have also investigated the reusability and reproducibility of this material. The above study demonstrates that Li3B7O12:Mn is a robust and promising candidate for medical proton dosimetry.
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Affiliation(s)
- Mini Agarwal
- Medical Physics Unit, IRCH, AIIMS, New Delhi- 110 029, India
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22
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Pittet P, Jalade P, Gindraux L, Guiral P, Wang R, Galvan JM, Lu GN. DoRGaN: Development of Quality Assurance and Quality Control Systems for High Dose Rate Brachytherapy Based on GaN Dosimetry Probes. Ing Rech Biomed 2018. [DOI: 10.1016/j.irbm.2018.04.005] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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23
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Comparison of incident air kerma (k i) of common digital and analog radiology procedures in Kohgiluyeh and Boyer-Ahmad province. POLISH JOURNAL OF MEDICAL PHYSICS AND ENGINEERING 2018. [DOI: 10.2478/pjmpe-2018-0006] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
Abstract
Introduction: Although in many developed countries, Analog radiography (AR) is replaced with digital radiography (DR) but AR is still widely used in many countries included Iran. Therefore, dosimetrically assessment of delivered dose is very important to avoid unnecessary patient dose.
Materials and Methods: In this study, all imaging centers in Kohgiluyeh and Boyer-Ahmad were selected. The initial information included the mean kVp and mAs used by the personnel to perform each radiological procedure were gathered through a questionnaire. Barracuda dosimeter was then used to measure Incident air kerma (ki). Data obtained from digital radiography (DR) and analogue radiography (AR) were then analyzed and compared to each other.
Results: The mean incident air kerma (ki) for five radiological procedures (chest AP&Lat, Skull AP&Lat, Lumbar spine AP&Lat, Thoracic spine AP&Lat and Pelvis) in digital devices were 0.38&1.34, 2.1&1.94, 4.99&7.83, 4.18& 6.41 and 4.33 mGy and those for analogue devices were 0.7&1.28, 3.05&3.02, 7.25&9.9, 7.125&8.36 and 5.36 mGy, respectively.
Discussion and Conclusion: The use of low kVp or high mAs is one of the reasons to increase the incident air kerma (ki) in analogue methods comparing to digital methods in all procedures except the chest (in Lateral view). Also the results, surprisingly, showed that in some of the analogue methods incident air kerma (ki) was less than digital methods which is most probably because of the auto-exposure conditions.
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Optical and thermal pre-readout treatments to reduce the influence of fading on LiMgPO 4 OSL measurements. Appl Radiat Isot 2018; 136:118-120. [PMID: 29494944 DOI: 10.1016/j.apradiso.2018.02.022] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/21/2017] [Revised: 02/15/2018] [Accepted: 02/19/2018] [Indexed: 11/23/2022]
Abstract
TL (Thermoluminescent) and OSL (Optically Stimulated Luminescence) techniques are both luminescent techniques widely applied in several areas into radiation dosimetry. The main difference between them are related to the employed stimulus (thermal or optical) for luminescent emission, as well as the advantages of each technique. Due to simplicity and not to be required heating, the OSL technique has been continuously improved and new researches in materials to be used with this technique have grown in the last decades. Nowadays the main problems in the application of the developed new materials are the poor stability and loss of OSL signal over time (fading). In this study, we performed a sequence of thermal (preheat) and optical (OSL with infra-red light stimulus) pre-readout treatments immediately before OSL readouts of LiMgPO4 based detectors (LMP), aiming the applicability of novel materials, contributing to find solutions to minimize the influence of fading. Moreover, it was demonstrated that the influence of fading is minimized and the stability of OSL signal from LMP is achieved using just optical process, without heating the material.
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Zhuang Y, Lv Y, Wang L, Chen W, Zhou TL, Takeda T, Hirosaki N, Xie RJ. Trap Depth Engineering of SrSi 2O 2N 2:Ln 2+,Ln 3+ (Ln 2+ = Yb, Eu; Ln 3+ = Dy, Ho, Er) Persistent Luminescence Materials for Information Storage Applications. ACS APPLIED MATERIALS & INTERFACES 2018; 10:1854-1864. [PMID: 29277986 DOI: 10.1021/acsami.7b17271] [Citation(s) in RCA: 47] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/06/2023]
Abstract
Deep-trap persistent luminescence materials exhibit unique properties of energy storage and controllable photon release under additional stimulation, allowing for both wavelength and intensity multiplexing to realize high-capacity storage in the next-generation information storage system. However, the lack of suitable persistent luminescence materials with deep traps is the bottleneck of such storage technologies. In this study, we successfully developed a series of novel deep-trap persistent luminescence materials in the Ln2+/Ln3+-doped SrSi2O2N2 system (Ln2+ = Yb, Eu; Ln3+ = Dy, Ho, Er) by applying the strategy of trap depth engineering. Interestingly, the trap depth can be tailored by selecting different codopants, and it monotonically increases from 0.90 to 1.18 eV in the order of Er, Ho, and Dy. This is well explained by the energy levels indicated in the host-referred binding energy scheme. The orange-red-emitting SrSi2O2N2:Yb,Dy and green-emitting SrSi2O2N2:Eu,Dy phosphors are demonstrated to be good candidates of information storage materials, which are attributed to their deep traps, narrow thermoluminescence glow bands, high emission efficiency, and excellent chemical stability. This work not only validates the suitability of deep-trap persistent luminescence materials in the information storage applications, but also broadens the avenue to explore such kinds of new materials for applications in anticounterfeiting and advanced displays.
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Affiliation(s)
- Yixi Zhuang
- College of Materials, and Fujian Provincial Key Laboratory of Materials Genome, Xiamen University , Simingnan Road 422, Xiamen 361005, P. R. China
| | - Ying Lv
- College of Materials, and Fujian Provincial Key Laboratory of Materials Genome, Xiamen University , Simingnan Road 422, Xiamen 361005, P. R. China
| | - Le Wang
- College of Optical and Electronic Technology, China Jiliang University , Hangzhou 310018, P. R. China
| | - Wenwei Chen
- College of Materials, and Fujian Provincial Key Laboratory of Materials Genome, Xiamen University , Simingnan Road 422, Xiamen 361005, P. R. China
| | - Tian-Liang Zhou
- College of Materials, and Fujian Provincial Key Laboratory of Materials Genome, Xiamen University , Simingnan Road 422, Xiamen 361005, P. R. China
| | - Takashi Takeda
- Sialon Group, Sialon Unit, National Institute for Materials Science , 1-1 Namiki, Tsukuba, Ibaraki 305-0044, Japan
| | - Naoto Hirosaki
- Sialon Group, Sialon Unit, National Institute for Materials Science , 1-1 Namiki, Tsukuba, Ibaraki 305-0044, Japan
| | - Rong-Jun Xie
- College of Materials, and Fujian Provincial Key Laboratory of Materials Genome, Xiamen University , Simingnan Road 422, Xiamen 361005, P. R. China
- Sialon Group, Sialon Unit, National Institute for Materials Science , 1-1 Namiki, Tsukuba, Ibaraki 305-0044, Japan
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26
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Dhabekar B, Rawat N, Gaikwad N, Kadam S, Koul D. Dosimetric characterization of highly sensitive OSL phosphor: LiCaAlF6:Eu,Y. RADIAT MEAS 2017. [DOI: 10.1016/j.radmeas.2017.10.005] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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27
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Dosimetric properties of MgB 4 O 7 :Dy,Li and MgB 4 O 7 :Ce,Li for optically stimulated luminescence applications. RADIAT MEAS 2017. [DOI: 10.1016/j.radmeas.2017.02.009] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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28
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Maraba D, Bulur E. Design and construction of an automated OSL reader with open source software and hardware. RADIAT MEAS 2017. [DOI: 10.1016/j.radmeas.2017.04.011] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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29
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Al2O3:C optically stimulated luminescence droplets: Characterization and applications in medical beams. RADIAT MEAS 2016. [DOI: 10.1016/j.radmeas.2016.09.003] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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30
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Woulfe P, Sullivan FJ, O’Keeffe S. Optical fibre sensors: their role in in vivo dosimetry for prostate cancer radiotherapy. Cancer Nanotechnol 2016; 7:7. [PMID: 27818715 PMCID: PMC5069313 DOI: 10.1186/s12645-016-0020-y] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/20/2016] [Accepted: 10/06/2016] [Indexed: 11/21/2022] Open
Abstract
Review is made of dosimetric studies of current optical fibre technology in radiotherapy for therapeutic applications, focusing particularly on in vivo dosimetry for prostate radiotherapy. We present the various sensor designs along with the main advantages and disadvantages associated with this technology. Optical fibres are ideally placed for applications in radiotherapy dosimetry; due to their small size they are lightweight and immune to electromagnetic interferences. The small dimensions of optical fibres allows it to be easily guided within existing brachytherapy equipment; for example, within the seed implantation needle for direct tumour dose analysis, in the urinary catheter to monitor urethral dose, or within the biopsy needle holder of the transrectal ultrasound probe to monitor rectal wall dose. The article presents the range of optical fibre dosimeter designs along with the main dosimetric properties required for a modern in vivo dosimetry system to be utilised in a clinical environment.
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Affiliation(s)
- P. Woulfe
- Optical Fibre Sensors Research Centre, University of Limerick, Limerick, Ireland
- Department of Radiotherapy Physics, Galway Clinic, Galway, Ireland
| | - F. J. Sullivan
- Prostate Cancer Institute, National University of Ireland Galway, Galway, Ireland
- Department of Radiotherapy, Galway Clinic, Galway, Ireland
| | - S. O’Keeffe
- Optical Fibre Sensors Research Centre, University of Limerick, Limerick, Ireland
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31
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Ahmed MF, Schnell E, Ahmad S, Yukihara EG. Image reconstruction algorithm for optically stimulated luminescence 2D dosimetry using laser-scanned Al2O3:C and Al2O3:C,Mg films. Phys Med Biol 2016; 61:7484-7506. [DOI: 10.1088/0031-9155/61/20/7484] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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32
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Wołowiec P, Kukołowicz P. The analysis of the measurement uncertainty with application of small detectors made of Gafchromic EBT films for the range of doses typical for in vivo dosimetry in teleradiotherapy. RADIAT MEAS 2016. [DOI: 10.1016/j.radmeas.2016.08.001] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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33
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Oliveira LC, Yukihara EG, Baffa O. MgO:Li,Ce,Sm as a high-sensitivity material for Optically Stimulated Luminescence dosimetry. Sci Rep 2016; 6:24348. [PMID: 27076349 PMCID: PMC4830961 DOI: 10.1038/srep24348] [Citation(s) in RCA: 36] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/25/2015] [Accepted: 03/24/2016] [Indexed: 11/28/2022] Open
Abstract
The goal of this work was to investigate the relevant dosimetric and luminescent properties of MgO:Li3%,Ce0.03%,Sm0.03%, a newly-developed, high sensitivity Optically Stimulated Luminescence (OSL) material of low effective atomic number (Zeff = 10.8) and potential interest for medical and personal dosimetry. We characterized the thermoluminescence (TL), OSL, radioluminescence (RL), and OSL emission spectrum of this new material and carried out a preliminary investigation on the OSL signal stability. MgO:Li,Ce,Sm has a main TL peak at ~180 °C (at a heating rate of 5 °C/s) associated with Ce3+ and Sm3+ emission. The results indicate that the infrared (870 nm) stimulated OSL from MgO:Li,Ce,Sm has suitable properties for dosimetry, including high sensitivity to ionizing radiation (20 times that of Al2O3:C, under the measurement conditions) and wide dynamic range (7 μGy–30 Gy). The OSL associated with Ce3+ emission is correlated with a dominant, practically isolated peak at 180 °C. Fading of ~15% was observed in the first hour, probably due to shallow traps, followed by subsequent fading of 6–7% over the next 35 days. These properties, together with the characteristically fast luminescence from Ce3+, make this material also a strong candidate for 2D OSL dose mapping.
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Affiliation(s)
- Luiz C Oliveira
- Departamento de Física, FFCLRP-Universidade de São Paulo, 14040-901 Ribeirão Preto-SP, Brazil
| | | | - Oswaldo Baffa
- Departamento de Física, FFCLRP-Universidade de São Paulo, 14040-901 Ribeirão Preto-SP, Brazil
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35
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Asfora VK, de Barros VS, da Silva RJ, Vasconcelos DA, Nobre BS, Yamato ME, Khoury HJ, Oliveira RA, Azevedo WM. Optically stimulated luminescence of CaF2:Tm. RADIAT MEAS 2016. [DOI: 10.1016/j.radmeas.2015.12.012] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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36
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