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Kim H, Yu H, Discher M, Kim MC, Choi Y, Lee H, Lee JT, Lee H, Kim YS, Kim HS, Lee J. A small-scale realistic inter-laboratory accident dosimetry comparison using the TL/OSL from mobile phone components. RADIAT MEAS 2022. [DOI: 10.1016/j.radmeas.2021.106696] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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Application of the buccal micronucleus cytome assay on child population exposed to sinus X-ray. Eur J Radiol 2020; 129:109143. [PMID: 32593079 DOI: 10.1016/j.ejrad.2020.109143] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/27/2020] [Revised: 05/27/2020] [Accepted: 06/16/2020] [Indexed: 02/04/2023]
Abstract
PURPOSE Diagnostic X-ray examinations of paranasal sinuses use a low-dose ionizing radiation to achieve medically indicated purposes. The effects of low-dose radiation are still controversial, making it a highly prioritized field of research. As there is a need to evaluate the effects of low-dose ionizing radiation and that children might be a more vulnerable population, we performed simultaneous physical dosimetry and buccal cell micronucleus cytome assay on pediatric patients before and after an X-ray examination of the sinuses. METHODS The study comprised 20 subjects aged 11.9 ± 3.6 years, and BMI < 25 kg/m2. Physical dosimetry was performed using radiophotoluminiscent (RPL) glass dosimeters placed on four positions on the head. The buccal cell micronucleus cytome assay was performed before and 14 ± 1 days after the X-ray exam, to monitor DNA damaging, replicative, cytostatic, and cell death effects. RESULTS The doses in the primary beam ranged 371-1106 μGy and were several fold higher than at the other positions on the head. As for biological changes, we did not observe any DNA damaging effects. However, a significant increase in cells with condensed chromatin was observed, indicating more cells undergoing early stages of apoptosis. We also observed inter-individual differences between the subjects. A correlation between the doses detected and biological effects was not observed. CONCLUSION Although we did not observe significant increase in DNA damage, further studies are needed to increase the statistical power of the results and ensure patients' safety and optimal health care.
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Tang K, Fan H, Cui H, Zhu H, Liu Z. Comparative studies on radioluminescent and thermoluminescent spectra of LiF:Mg,Cu,P and LiF:Mg,Cu,Si. RADIATION PROTECTION DOSIMETRY 2016; 168:459-464. [PMID: 26264711 DOI: 10.1093/rpd/ncv377] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/19/2015] [Accepted: 07/10/2015] [Indexed: 06/04/2023]
Abstract
The influence of various annealing treatments on radioluminescent (RL) and thermoluminescent (TL) spectra of LiF:Mg,Cu,Si and LiF:Mg,Cu,P was investigated. The TL and RL emission bands for LiF:Mg,Cu,P are not the same; however, the emission band peaking at ∼383 nm is predominant in the TL and RL emission for LiF:Mg,Cu,Si. With the increase in annealing temperatures in the range of 240-300°C, for LiF:Mg,Cu,P, the intensity of TL decreases much more rapidly than that of RL. For LiF:Mg,Cu,Si, the area ratios of the two bands of RL and TL remain constant within experimental errors. It suggests that there is a significant decrease in the concentration of recombination centres in LiF:Mg,Cu,P after the annealing, in addition to the decrease in trapping centres, the recombination centres for main TL emission and RL emission in LiF:Mg,Cu,Si are the same, and the recombination centres for TL emission and RL emission in LiF:Mg,Cu,P are not the same. P is a more effective dopant than Si.
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Affiliation(s)
- K Tang
- State Key Laboratory of NBC Protection for Civilian, PO Box 1044, Ext. 201, Beijing 102205, P.R. China Solid Dosimetric Detector and Method Laboratory, PO Box 1044, Ext. 204, Beijing 102205, P.R. China
| | - H Fan
- Solid Dosimetric Detector and Method Laboratory, PO Box 1044, Ext. 204, Beijing 102205, P.R. China
| | - H Cui
- Solid Dosimetric Detector and Method Laboratory, PO Box 1044, Ext. 204, Beijing 102205, P.R. China
| | - H Zhu
- Solid Dosimetric Detector and Method Laboratory, PO Box 1044, Ext. 204, Beijing 102205, P.R. China
| | - Z Liu
- Solid Dosimetric Detector and Method Laboratory, PO Box 1044, Ext. 204, Beijing 102205, P.R. China
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Mohammadi K, Khayat O, Afarideh H. The effect of Mg, Cu and P impurities on dose response of LiF:Mg,Cu,P phosphors: simulation versus experiments. RADIATION PROTECTION DOSIMETRY 2016; 168:19-26. [PMID: 25634900 DOI: 10.1093/rpd/ncv002] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/15/2014] [Accepted: 12/31/2014] [Indexed: 06/04/2023]
Abstract
In this research, the effect of magnesium (Mg), copper (Cu) and phosphorus (P) impurities on dosimetry response of LiF:Mg,Cu,P phosphors is studied experimentally and by the simulation procedure. In the experimental procedure, LiF:Mg,Cu,P phosphors in the powder form were synthesised by chemical co-precipitation method. After annealing at 250°C for 10 min, known amounts of powder were exposed to gamma doses from 0.2 to 1 Gy. The activation energy of the electronic traps for the dosimetric peak at 150°C in LiF:Mg,Cu,P crystalline lattice obtained was 0.69 eV. In the simulation study, the role of stated dopants on electronic and structural properties of LiF crystalline lattice is investigated with the WIEN2 K Code. The activation energies of the electronic and hole traps for the dosimetric peak at the same temperature in LiF:Mg,Cu,P crystalline lattice obtained are 0.75 and 3.1 eV, respectively. It is shown that the experimental results are in agreement with simulation results.
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Affiliation(s)
| | - Omid Khayat
- Energy Engineering and Physics Department, Amirkabir University of Technology, 424 Hafez Ave., Tehran, Iran
| | - Hossein Afarideh
- Energy Engineering and Physics Department, Amirkabir University of Technology, 424 Hafez Ave., Tehran, Iran
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Alajerami YSM, Hashim S, Ghoshal SK, Ramli AT, Saleh MA, Ibrahim Z, Kadni T, Bradley DA. Luminescence characteristics of Li₂CO₃-K₂CO₃-H₃BO₃ glasses co-doped with TiO₂/MgO. Appl Radiat Isot 2013; 82:12-9. [PMID: 23948307 DOI: 10.1016/j.apradiso.2013.07.005] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/04/2012] [Revised: 04/06/2013] [Accepted: 04/07/2013] [Indexed: 11/30/2022]
Abstract
Understanding the influence of co-dopants in the luminescence enhancement of carbonate glasses is the key issue in dosimetry. A series of borate glasses modified by lithium and potassium carbonate were synthesized by the melt-quenching method. The glass mixture activated with various concentrations of TiO2 and MgO was subjected to various doses of gamma-rays ((60)Co). The amorphous nature of the samples was confirmed by x-ray diffraction (XRD) spectra. The simple glowing curve of the glass doped with TiO2 features a peak at 230°C, whose intensity is maximal at 0.5 mol% of the dopant. The intensity of the glowing curve increases with the concentration of MgO added as a co-dopant up to 0.25 mol%, where it is two times higher than for the material without MgO thermoluminescence properties, including dose response, reproducibility, and fading were studied. The effective atomic number of the material was also determined. Kinetic parameters, such as kinetics order, activation energy, and frequency factor are estimated. The photoluminescence spectra of the titanium-doped glass consist of a prominent peaks at 480 nm when laser excitation at 650 nm is used. A three-fold photoluminescence enhancement and a blue shift of the peak were observed when 0.1% MgO was introduced. In addition, various physical parameters, such as ion concentration, polaron radius and internuclear distances were calculated. The mechanism for the thermoluminescence and photoluminescence enhancements are discussed.
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Affiliation(s)
- Yasser Saleh Mustafa Alajerami
- Department of Physics, Universiti Teknologi Malaysia, 81310 Skudai, Johor, Malaysia; Department of Medical Radiography, Al-Azhar University, Gaza Strip, Palestine.
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Tang K, Cui H, Zhu H, Liu Z, Fan H. On the roles of dopants in LiF:Mg,Cu,Si thermoluminescent material. RADIATION PROTECTION DOSIMETRY 2013; 155:141-145. [PMID: 23313867 DOI: 10.1093/rpd/ncs333] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
The 3D thermoluminescent spectra and glow curves of LiF:Mg,Cu,Si with various Mg, Cu and Si concentrations were measured. The shapes of the glow curves in LiF:Mg,Cu,Si, LiF:Mg,Cu and LiF:Mg,Si are similar and the glow curves have peaks at approximately the same temperatures, but with significantly different intensities. Neither the temperature of the glow peak nor the wavelength of the emission maximum changes with variation of dopants concentrations when Cu is more than 0.01 mol % in LiF:Mg,Cu,Si. The spectrum structure in LiF:Mg,Cu,Si, LiF:Mg,Cu and LiF:Mg,Si is similar in the 300-550 nm range. Some weak emissions around 610 nm are shown in LiF:Mg,Cu,Si with a Cu concentration of 0.01 mol % and in LiF:Mg,Si. It is concluded that Mg dopant mainly plays a role in the formation of trapping centres, both Cu and Si play a role in the main emission process and Cu also plays a role in reducing the emission around 610 nm.
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Affiliation(s)
- K Tang
- Solid Dosimetric Detector and Method Laboratory, PO Box 1044 Ext. 204, Beijing 102205, PR China.
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Mohammadi K, Moussavi Zarandi A, Afarideh H, Shahmaleki S. Role of dopants in LiF:Mg,Cu, LiF:Mg,P and LiF:Mg,Cu,P detectors. J SOLID STATE CHEM 2013. [DOI: 10.1016/j.jssc.2013.02.036] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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The dependence of thermoluminescence of LiF:Mg,Cu,Si on sintering temperatures and dopants concentrations. RADIAT MEAS 2013. [DOI: 10.1016/j.radmeas.2012.11.004] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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