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Thermoluminescent relative efficiency of TLD-100 glow peaks after exposure to X-rays of 20 kV–300 kV, 137Cs and 60Co gamma
Radiation Measurements ( IF 2 ) Pub Date : 2021-07-17 , DOI: 10.1016/j.radmeas.2021.106635
E. Arzaga-Barajas 1 , G. Massillon-JL 1
Affiliation  

Thermoluminescent dosimeter LiF:Mg, Ti (TLD-100) has been considered as the “gold standard” to measure absorbed dose from low-energy photon fields in medical applications. However, to calibrate the dosimeters, high energy beams (6 MV X-ray or 60Co gamma) are usually used since low photon energy beams are not always available. Thus, knowledge of the relative efficiency, RE, is necessary in order to convert the absorbed dose calibration from high energy beams to low-energy photon fields like those used in brachytherapy and diagnostic. In this work, RE as a function of the photon energy, besides, the influence of the phantom material used to collocate the dosimeters during irradiation has been studied. Thermoluminescent glow curves were deconvolved into 9 individual glow peaks by using an algorithm developed in Matlab based on the Podgorsak approximation using the first-order kinetics model. The influence of the phantom material on the dosimeter response is observed in every glow peak, where RE values are lower in air compared to other materials such as polymethyl methacrylate. For all the glow peaks, RE as a function of the mean photon energy shows a region with a minimum and a maximum.



中文翻译:

暴露于 20 kV–300 kV、137 Cs 和60 Co gamma X 射线后 TLD-100 辉光峰的热释光相对效率

热释光剂量计 LiF:Mg, Ti (TLD-100) 已被视为医疗应用中测量低能光子场吸收剂量的“黄金标准”。然而,为了校准剂量计,通常使用高能束(6 MV X 射线或60 Co 伽马),因为低光子能量束并不总是可用。因此,需要了解相对效率RE,以便将吸收剂量校准从高能光束转换为低能光子场,如近距离放射治疗和诊断中使用的那些。在这项工作中,RE此外,作为光子能量的函数,还研究了在辐照期间用于配置剂量计的体模材料的影响。通过使用在 Matlab 中基于 Podgorsak 近似使用一阶动力学模型开发的算法,将热释光发光曲线解卷积为 9 个单独的发光峰。在每个辉光峰中都观察到了体模材料对剂量计响应的影响,与其他材料(如聚甲基丙烯酸甲酯)相比,空气中的RE值较低。对于所有辉光峰,作为平均光子能量的函数的RE显示具有最小值和最大值的区域。

更新日期:2021-07-19
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