核电厂热释光个人剂量监测环境本底扣除修正

Correction of Background Subtraction forTLD Personal Dose Monitoring in Nuclear Power Plants

介绍了热释光(TLD)个人剂量监测中环境本底剂量监测的常用方法和核电厂普遍采用的本底扣除方法。核电厂TLD监测具有监测人数多、使用数量大、测读/退火耗时长的特点,而目前核电厂普遍采用的TLD本底扣除方法,忽略了大批量TLD测量和退火时间不同造成的本底剂量差异,对监测结果准确性形成大的影响。针对上述问题,本文尝试使用时间累积本底,针对每个剂量计的测读和退火时间,进行本底扣除,消除TLD退火和测读时间差异形成的剂量误差,提高核电厂职业外照射个人剂量监测的准确性。

The methods of background subtraction for thermoluminescence(TLD)personal dose monitoring commonly used in nuclear power plants are presented.TLD monitoring in NPPs has the characteristics of a large number of measurements,a large number of uses,and a long time-consuming measurement/annealing.The current subtraction method commonly used ignores the background differences caused by the scale of measurements and differet annealing times,which have a great impact on the accuracy of monitoring results.In response to the above problems,we attempt to use the cumulative time background to perform subtraction,for each dosimeter's reading and annealing time,to eliminate the dose error caused by these differences,so as to improve the accuracy of personal dose monitoring of occupational external exposure in nuclear power plants.