Calibration of EPR signal dose response of tooth enamel to photons: Experiment and Monte Carlo simulation
Calibration of EPR signal dose response of tooth enamel to photons: Experiment and Monte Carlo simulation
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DOI：
10.1093/rpd/nch040
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发表时间：
2004-01-01
影响因子：
1
通讯作者：
Hoshi, M
中科院分区：
文献类型：
--
作者：
Ivannikov, AI;Tikunov, DD;Hoshi, M
根据人牙釉质的吸收剂量，分析了13k -1.25 MeV光子辐照下电子顺磁共振（EPR）辐射诱导信号的能量依赖性。后者是用蒙特卡罗模拟的光子和电子传递来计算的。分析了计算的吸收剂量与样品厚度的关系。在37 kv -1.25 MeV范围内，EPR信号对牙釉质吸收剂量无能量依赖性。在13 keV和20 keV时，EPR信号剂量响应降低了8%，可能是由于样品粉末化。计算了1.25 MeV光子在聚甲基丙烯酸甲酯和铝堆积材料中辐照的牙釉质样品的剂量深度分布。结果表明，该材料较好地满足了铝辐照的二次电子平衡条件，使该材料更适合用于标定。
The experimental energy dependence of the electron paramagnetic resonance (EPR) radiation-induced signal at irradiation by photons in the energy range of 13 keV-1.25 MeV was analysed in terms of the absorbed dose in human tooth enamel. The latter was calculated using a Monte Carlo simulation of the photon and electron transport. The dependence of the calculated absorbed dose on the sample thickness was analysed. No energy dependence of the EPR signal on the absorbed dose in enamel was verified in the range of 37 keV-1.25 MeV. At 13 and 20 keV the EPR signal dose response was reduced by 8% probably due to sample powdering. Dose-depth profiles in enamel samples irradiated by 1.25 MeV photons in polymethylmethacrylate and aluminium build-up materials were calculated. It was concluded that secondary electron equilibrium conditions are better fulfiled for irradiation in aluminium, which makes this material preferable for calibration.