退火温度对热释光探测器性能的影响

摘要

目的:通过实验探究最优的热释光探测器退火方式,提高辐射剂量测量质量.方法:将60片热释光探测器随机分为6个小组,每小组10片,分别在200、220、230、240、250、260℃下退火10 min,随后对各组进行相同方式的冷却,在标准辐射源照射完成后进行测量.重复退火测量10次,观察比较各组的分散性、灵敏度以及发光曲线情况.结果:单次退火辐照测量结果显示,采取240℃退火温度时灵敏度、分散性和发光曲线综合效果最佳;重复10次退火辐照,250℃退火温度条件下分散性最佳,但随退火次数递增其测量灵敏度下降明显,因此240℃退火温度时综合效果最佳.结论:退火是热释光测量系统的重要环节,应根据不同探测器要求选择和严格掌握退火条件.%Objective To improve the quality of personal dose equivalent measurement by exploring optimal annealing temperature conditions.Methods Totally 60 pieces of thermoluminescent detectors were randomly and equally divided into 6 groups.The 6 groups underwent 10-min annealing under 200,220,230,240,250 or 260 ℃ respectively,and then were cooled with the same conditions and went through measurement after irradiation by the calibrated radiation source.The above operation of annealing,cooling and measurement were repeated for 10 times,and the 6 groups were compared on dispersity,sensitivity and glow curve.Results Single test proved that under 240 ℃ the dispersity,sensitivity and glow curve gained optimal results comprehensively,while repeated tests showed that the dispersity had the optimal value under 250 ℃ and the sensitivity decreased significantly as the times of annealing rose.Conclusion Annealing conditions have to be selected according to the requirements of the thermoluminescent detector.