摘要
目的为探索贴片电阻用于核事故后的回顾性剂量重建的可行性,分析保存温度和保存时间对贴片电阻光释光(OSL)特性的影响,探索降低二者影响的方法。方法在不同参数条件下,利用丹麦Ris?公司的热释光和光释光自动测量仪对贴片电阻进行测量,分析不同保存温度和保存时间对贴片电阻OSL信号的影响。结果贴片电阻在辐照后短时间(10 min)内OSL信号呈指数规律衰减,放置2~7 d,测量计数的变化趋于稳定(计数变化<10%)。在0.1~2 Gy辐照后保存1~3 d贴片电阻的剂量线性响应良好。贴片电阻的OSL信号随保存温度的增加而减少,但采用130℃预热1 min可有效消除保存温度在25~45℃范围内对贴片电阻OSL信号的差异。结论贴片电阻样品的保存温度和保存时间均会影响其OSL信号,但采用130℃预热1 min的测量方法可使保存时间在1~7 d和保存温度在25~45℃的贴片电阻的OSL信号误差在10%以内,证明了实际应用中预热测量的必要性,为贴片电阻可用于回顾性剂量重建提供了较为科学的测量方法和依据。
Objective To assess the feasibility of employing chip resistors for retrospective dose reconstruction following nuclear accidents,to examine the effects of storage temperature and storage time on the optically stimulated luminescence(OSL)characteristics of the chip resistors,and to explore measures to mitigate these effects.Methods Chip resistors were analyzed using automated instruments for measuring thermoluminescence and OSL manufactured by Risøin Denmark with various parameters to understand the impact of storage temperature and storage time on OSL signals.Results The OSL signals of chip resistors exhibited exponential attenuation within 10 min after irradiation,and then stabilized(count change<10%)within 2-7 days of storage.The chip resistors exhibited linear dose responses within 1-3 days of storage after 0.1-2 Gy irradiation.OSL signals diminished as the storage temperature increased.However,preheating at 130℃for 1 min effectively eliminated the differences caused by temperatures between 25℃and 45℃.Conclusion The OSL signals of chip resistors are influenced by storage temperature and storage time.When preheated at 130℃for 1 min,chip resistors stored for 1-7 days and at 25-45℃exhibited OSL signal errors of 10%or less.This result emphasizes the importance of preheating for measurements in practical applications,thus providing a scientific approach and a solid foundation for the use of chip resistors in retrospective dose reconstruction.
作者
王俊霖
吴建华
刘阳
陈凌
WANG Junlin;WU Jianhua;LIU Yang;CHEN Ling(China Institute of Atomic Energy,Beijing 102413 China)
出处
《中国辐射卫生》
2024年第3期273-277,282,共6页
Chinese Journal of Radiological Health
关键词
光释光
贴片电阻
剂量重建
保存温度
保存时间
Optically stimulated luminescence
Chip resistors
Dose reconstruction
Storage temperature
Storage time
