Bakshi A K, Chatterjee S, Kher R K
Radiological Physics and Advisory Division, Bhabha Atomic Research Centre, Mumbai, India.
Radiat Prot Dosimetry. 2008;129(4):456-62. doi: 10.1093/rpd/ncm369. Epub 2007 Sep 11.
Response of thermoluminescence (TL) discs under different filter regions of a CaSO(4):Dy based TL dosemeter system was simulated to high-energy photon beams in the energy range of 1.25 MeV to 24 MV ( approximately 9 MeV). This was done using FLUKA Monte Carlo code and also experimentally verified for some energy points. Response of disc D1 under metal filter combination was found to increase with photon energy, whereas that for the discs under polystyrene filter and open window regions of the dosemeter decreases continuously. The changes in the response of the discs under polystyrene filter and open window were attributed to the lack of build-up material. The increase in the response of disc D1 was due to the contribution from secondary electrons produced through Compton and pair production processes mainly arising out from the metal filter combination. The knowledge of the change in the response of individual discs and the ratio of discs' responses under different filter regions of the dosemeter system could be used for the measurement of energy of bremsstrahlung radiation that exists in and around high-energy electron accelerator and could be used for accurate evaluation of personal dose equivalent in high-energy photon field.
基于CaSO(4):Dy的热释光（TL）剂量计系统在不同滤光区域下的热释光圆盘对能量范围为1.25 MeV至24 MV（约9 MeV）的高能光子束的响应进行了模拟。这是使用FLUKA蒙特卡罗代码完成的，并且还对一些能量点进行了实验验证。发现金属滤光组合下圆盘D1的响应随光子能量增加，而剂量计聚苯乙烯滤光片和开窗区域下圆盘的响应则持续下降。聚苯乙烯滤光片和开窗区域下圆盘响应的变化归因于缺乏积累材料。圆盘D1响应的增加是由于主要由金属滤光组合产生的康普顿和电子对产生过程中产生的二次电子的贡献。了解剂量计系统不同滤光区域下各个圆盘响应的变化以及圆盘响应的比率，可用于测量高能电子加速器及其周围存在的轫致辐射的能量，并可用于准确评估高能光子场中的个人剂量当量。
