Ivannikov A I, Skvortsov V G, Stepanenko V F, Tsyb A F, Khamidova L G, Tikunov D D
Medical Radiological Research Center of RAMS, Obninsk, Russia.
Appl Radiat Isot. 2000 May;52(5):1291-6. doi: 10.1016/s0969-8043(00)00086-5.
Some of the most important sources of systematic errors in dose determination using tooth enamel EPR spectroscopy and ways of reducing those errors are discussed. Enamel from the outside of the front teeth should not be used for dose determination because of induction of paramagnetic centers by solar light. The accuracy of the method in the low dose range is limited by variation in the shape of the EPR signal of unirradiated enamel, which can be described by an initial intrinsic signal and which varies for different samples with standard deviation of 20-30 mGy. The energy dependence of enamel sensitivity should be taken into account in the form of a correction factor. The value of this factor is estimated at 1.1-1.3 for real radiation fields in radiation contaminated territories. Variation in enamel sensitivity for different samples is shown to be within limits of 10-15% of the average value.
讨论了使用牙釉质电子顺磁共振光谱法进行剂量测定时一些最重要的系统误差来源以及减少这些误差的方法。由于太阳光会诱导顺磁中心，所以不应使用前门牙外部的牙釉质进行剂量测定。该方法在低剂量范围内的准确性受到未辐照牙釉质电子顺磁共振信号形状变化的限制，这种变化可用初始固有信号来描述，不同样品的该信号存在差异，标准偏差为20 - 30 mGy。牙釉质灵敏度的能量依赖性应以校正因子的形式加以考虑。对于受辐射污染地区的实际辐射场，该因子的值估计为1.1 - 1.3。不同样品的牙釉质灵敏度变化显示在平均值的10 - 15%范围内。
