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Jopat PR, Paul S, Sen S, Bahadur J, Patra GD, Samanta S, Pathak A, Kulkarni MS. LiAlO 2:Gd-Based Versatile and Ultrasensitive Detector for Gamma and Neutrons by Thermal and Optical Stimulation. ACS APPLIED MATERIALS & INTERFACES 2024; 16:39642-39655. [PMID: 39013073 DOI: 10.1021/acsami.4c07765] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 07/18/2024]
Abstract
Considering the low-level dose detection requirement for neutron and γ radiation in cancer therapy, synthesis and exploratory studies have been performed on a newly developed phosphor LiAlO2:Gd. Our results reveal that the presence of both Li and Gd makes it sensitive to both gamma and thermal neutrons. The applicability of LiAlO2:Gd for beta, gamma, and neutrons in both thermally stimulated and optically stimulated modes has been verified by extensive experiments followed by kinetic parametric evaluation with theoretical calculations. The current work confirms that LiAlO2:Gd is a highly sensitive phosphor with a minimum detectable dose of 5.7 μSv for gamma and 92 μSv for themral neutrons. The phosphor is found to show very high sensitivity at low energy and dose. Its ability for detection and discrimination of both gamma and thermal neutrons makes it a potential material to be used in medical dosimetry.
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Affiliation(s)
- Pragya R Jopat
- Technical Physics Division, Bhabha Atomic Research Centre, Mumbai 400085, India
- Homi Bhabha National Institute, Mumbai 400094, India
| | - Sabyasachi Paul
- Homi Bhabha National Institute, Mumbai 400094, India
- Health Physics Division, Bhabha Atomic Research Centre, Mumbai 400085, India
| | - Shashwati Sen
- Technical Physics Division, Bhabha Atomic Research Centre, Mumbai 400085, India
- Homi Bhabha National Institute, Mumbai 400094, India
| | - Jitendra Bahadur
- Homi Bhabha National Institute, Mumbai 400094, India
- Solid State Physics Division, Bhabha Atomic Research Centre, Mumbai 400085, India
| | - Giri Dhari Patra
- Technical Physics Division, Bhabha Atomic Research Centre, Mumbai 400085, India
- Homi Bhabha National Institute, Mumbai 400094, India
| | - Soumen Samanta
- Technical Physics Division, Bhabha Atomic Research Centre, Mumbai 400085, India
| | - Ankita Pathak
- Technical Physics Division, Bhabha Atomic Research Centre, Mumbai 400085, India
| | - Mukund S Kulkarni
- Homi Bhabha National Institute, Mumbai 400094, India
- Health Physics Division, Bhabha Atomic Research Centre, Mumbai 400085, India
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Jensen ML, Julsgaard B, Turtos RM, Skyt PS, Jensen MB, Muren LP, Balling P. High-resolution three-dimensional dosimetry in clinically relevant volumes utilizing optically stimulated luminescence. Med Phys 2024; 51:2200-2209. [PMID: 37929802 DOI: 10.1002/mp.16796] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/18/2023] [Revised: 08/29/2023] [Accepted: 09/21/2023] [Indexed: 11/07/2023] Open
Abstract
BACKGROUND The continued development of new radiotherapy techniques requires dosimetry systems that satisfy increasingly rigorous requirements, such as high sensitivity, wide dose range, and high spatial resolution. An emerging requirement is the ability to read out doses in three dimensions (3D) with high precision and spatial resolution. A few dosimetry systems with 3D capabilities are available, but their application in a clinical workflow is limited for various reasons, primarily originating from their chemical nature. The search for a 3D dosimetry system with potential for clinical implementation is thus ongoing. PURPOSE To demonstrate the capabilities of a novel optically-stimulated-luminescence (OSL)-based 3D dosimetry system capable of measuring radiation doses in clinically relevant volumes. METHODS A laser-based readout system was used to measure dose distributions delivered by both photons and protons, utilizing the OSL from a50 × 50 × 50 $50\times 50\times 50$ mm3 $^3$ YSO:Ce crystal. A homogeneous treatment plan consisting of two opposing photon fields was used to establish an inhomogeneity correction map of the crystal response and demonstrated the accuracy and precision of the system. The crystal was additionally irradiated with a photon treatment plan consisting of three overlapping10 × 10 $10\times 10$ mm2 $^2$ fields delivered from different angles, and a proton treatment plan consisting of four pencil beams with energies 90 MeV (× 2 $\times 2$ ), 115 MeV, and 140 MeV. The system abilities were quantified by comparing the 3D-resolved measurements to Monte Carlo simulations. RESULTS The dose map reproducibility of the system was found to be within 2% including both statistical and systematic errors. The measurements yielded integrated doses from a volume of50 × 50 × 40 $50\times 50\times 40$ mm3 $^3$ with voxel volumes of just0.28 × 0.28 × 0.50 $0.28\times 0.28\times 0.50$ mm3 $^3$ . An excellent agreement between the 3D-resolved measurements and the simulations was found for both photon- and proton-irradiation. CONCLUSIONS The capabilities of the devised system for measuring clinically relevant fields of photons and proton pencil beams within a clinically relevant volume were demonstrated. The system poses as a promising candidate for clinical applications, and enables future research in the field of OSL-based tissue-equivalent 3D dosimetry.
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Affiliation(s)
- Mads L Jensen
- Department of Physics and Astronomy, Aarhus University, Aarhus, Denmark
| | - Brian Julsgaard
- Department of Physics and Astronomy, Aarhus University, Aarhus, Denmark
- Interdisciplinary Nanoscience Center, Aarhus University, Aarhus, Denmark
| | - Rosana M Turtos
- Department of Physics and Astronomy, Aarhus University, Aarhus, Denmark
| | - Peter S Skyt
- Danish Centre for Particle Therapy, Aarhus University Hospital, Aarhus, Denmark
| | - Morten B Jensen
- Danish Centre for Particle Therapy, Aarhus University Hospital, Aarhus, Denmark
- Department of Medical Physics, Aarhus University Hospital, Aarhus, Denmark
| | - Ludvig P Muren
- Danish Centre for Particle Therapy, Aarhus University Hospital, Aarhus, Denmark
- Department of Clinical Medicine, Aarhus University, Aarhus, Denmark
| | - Peter Balling
- Department of Physics and Astronomy, Aarhus University, Aarhus, Denmark
- Interdisciplinary Nanoscience Center, Aarhus University, Aarhus, Denmark
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Bossin L, Plokhikh I, Christensen JB, Gawryluk DJ, Kitagawa Y, Leblans P, Tanabe S, Vandenbroucke D, Yukihara EG. Addressing Current Challenges in OSL Dosimetry Using MgB 4O 7:Ce,Li: State of the Art, Limitations and Avenues of Research. MATERIALS (BASEL, SWITZERLAND) 2023; 16:3051. [PMID: 37109886 PMCID: PMC10142933 DOI: 10.3390/ma16083051] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 02/28/2023] [Revised: 03/29/2023] [Accepted: 04/03/2023] [Indexed: 06/19/2023]
Abstract
The objective of this work is to review and assess the potential of MgB4O7:Ce,Li to fill in the gaps where the need for a new material for optically stimulated luminescence (OSL) dosimetry has been identified. We offer a critical assessment of the operational properties of MgB4O7:Ce,Li for OSL dosimetry, as reviewed in the literature and complemented by measurements of thermoluminescence spectroscopy, sensitivity, thermal stability, lifetime of the luminescence emission, dose response at high doses (>1000 Gy), fading and bleachability. Overall, compared with Al2O3:C, for example, MgB4O7:Ce,Li shows a comparable OSL signal intensity following exposure to ionizing radiation, a higher saturation limit (ca 7000 Gy) and a shorter luminescence lifetime (31.5 ns). MgB4O7:Ce,Li is, however, not yet an optimum material for OSL dosimetry, as it exhibits anomalous fading and shallow traps. Further optimization is therefore needed, and possible avenues of investigation encompass gaining a better understanding of the roles of the synthesis route and dopants and of the nature of defects.
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Affiliation(s)
- Lily Bossin
- Department of Radiation Safety and Security, Paul Scherrer Institute, Forschungsstrasse 111, 5232 Villigen, Switzerland (E.G.Y.)
| | - Igor Plokhikh
- Department of Radiation Safety and Security, Paul Scherrer Institute, Forschungsstrasse 111, 5232 Villigen, Switzerland (E.G.Y.)
- Laboratory for Multiscale Materials Experiments, Paul Scherrer Institute, Forschungsstrasse 111, 5232 Villigen, Switzerland
| | - Jeppe Brage Christensen
- Department of Radiation Safety and Security, Paul Scherrer Institute, Forschungsstrasse 111, 5232 Villigen, Switzerland (E.G.Y.)
| | - Dariusz Jakub Gawryluk
- Laboratory for Multiscale Materials Experiments, Paul Scherrer Institute, Forschungsstrasse 111, 5232 Villigen, Switzerland
| | - Yuuki Kitagawa
- National Institute of Advanced Industrial Science and Technology (AIST), Ikeda, Osaka 563-8577, Japan
| | - Paul Leblans
- Radiology Division, Agfa NV, 2640 Mortsel, Belgium
| | - Setsuhisa Tanabe
- Graduate School of Human and Environmental Studies, Kyoto University, Kyoto 606-8501, Japan
| | | | - Eduardo Gardenali Yukihara
- Department of Radiation Safety and Security, Paul Scherrer Institute, Forschungsstrasse 111, 5232 Villigen, Switzerland (E.G.Y.)
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Martins R, Ferreira I, Silva A, Nunes M, Ulsen C, Künzel R, Souza M, Chithambo M, Yoshimura E, Trindade N. Thermoluminescence of rose quartz from Minas Gerais, Brazil. Radiat Phys Chem Oxf Engl 1993 2023. [DOI: 10.1016/j.radphyschem.2023.110960] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/09/2023]
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Sądel M, Grzanka L, Swakoń J, Baran J, Gajewski J, Bilski P. Optically Stimulated Luminescent Response of the LiMgPO 4 Silicone Foils to Protons and Its Dependence on Proton Energy. MATERIALS (BASEL, SWITZERLAND) 2023; 16:ma16051978. [PMID: 36903093 PMCID: PMC10004104 DOI: 10.3390/ma16051978] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/31/2023] [Revised: 02/23/2023] [Accepted: 02/24/2023] [Indexed: 05/27/2023]
Abstract
Modern radiotherapy (RT) techniques, such as proton therapy, require more and more sophisticated dosimetry methods and materials. One of the newly developed technologies is based on flexible sheets made of a polymer, with the embedded optically stimulated luminescence (OSL) material in the form of powder (LiMgPO4, LMP) and a self-developed optical imaging setup. The detector properties were evaluated to study its potential application in the proton treatment plan verification for eyeball cancer. The data showed a well-known effect of lower luminescent efficiency of the LMP material response to proton energy. The efficiency parameter depends on a given material and radiation quality parameters. Therefore, the detailed knowledge of material efficiency is crucial in establishing a calibration method for detectors exposed to mixed radiation fields. Thus, in the present study, the prototype of the LMP-based silicone foil material was tested with monoenergetic uniform proton beams of various initial kinetic energies constituting the so-called spread-out Bragg peak (SOBP). The irradiation geometry was also modelled using the Monte Carlo particle transport codes. Several beam quality parameters, including dose and the kinetic energy spectrum, were scored. Finally, the obtained results were used to correct the relative luminescence efficiency response of the LMP foils for monoenergetic and spread-out proton beams.
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Affiliation(s)
- Michał Sądel
- Institute of Nuclear Physics, Polish Academy of Sciences, 31-342 Kraków, Poland
| | - Leszek Grzanka
- Institute of Nuclear Physics, Polish Academy of Sciences, 31-342 Kraków, Poland
| | - Jan Swakoń
- Institute of Nuclear Physics, Polish Academy of Sciences, 31-342 Kraków, Poland
| | - Jakub Baran
- Faculty of Physics, Astronomy and Applied Computer Science, Jagiellonian University, 30-348 Kraków, Poland
| | - Jan Gajewski
- Institute of Nuclear Physics, Polish Academy of Sciences, 31-342 Kraków, Poland
| | - Paweł Bilski
- Institute of Nuclear Physics, Polish Academy of Sciences, 31-342 Kraków, Poland
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