量程至MGy的石英剂量计性能研究

陈义珍; 崔莹; 张卫东; 罗瑞; 林敏; 夏文; 陈克胜

doi:10.7538/tws.2021.youxian.066

量程至MGy的石英剂量计性能研究

中国原子能科学研究院计量与校准技术国家重点实验室,北京102413

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出版历程
- 刊出日期: 2022-08-19

The Performance of Quartz Dosimeter with Range to MGy

National Key Laboratory for Metrology and Calibration Techniques,China Institute of Atomic Energy, Beijing 102413, China

摘要

摘要: 为建立剂量可至MGy超高剂量范围的新型剂量计，本研究以石英为敏感材料，利用电子自旋共振（ESR）方法测量样品经γ射线或电子束辐照后产生的信号强度，开展石英种类选择、辐照后的线性、稳定性研究。结果表明，高纯石英适合作为超高剂量范畴的工作剂量计原材料。石英样品辐照后经15 min、300 ℃的热处理，信号强度在一年内能保持较好的稳定性，变化<3% ，且其吸收剂量与石英E′信号强度在10~10³ kGy剂量范围内成一定的函数关系，两者之间的拟合系数>0.99，相比于未经热处理的高纯石英样品，稳定性及拟合函数R²均得到明显提升。以上结果表明，石英剂量计适合作为超高剂量范畴的工作剂量计。
- 石英 /
- 电子自旋共振 /
- 剂量 /
- 辐照 /
- 稳定性
Abstract: To study the new type of dosimeter with a dose up to the ultra-high dose range of MGy, the electron spin resonance (ESR) method is used to measure the signal intensity of the sample irradiated by gamma rays or electron beams. Preliminary studies have been carried out through the selection of sensitive materials, linearity after irradiation, and stability. The results showed that the quartz can be used as a raw material for ultra-high dosimeters. After 15 min 300 ℃ proper heat treatment, the signal intensity of the irradiated quartz sample can maintain good stability within one year with a change of less than 3%. The radiation dose and the E′ signal intensity of quartz are proportional to the dose range of 10-10³ kGy. The fitting coefficient is above 0.99. Compared with the high-purity quartz sample without heat treatment, the stability and R² of fitting function of quartz sample are significantly improved. Therefore, the quartz dosimeter is suitable as a working dosimeter in the ultra-high dose range.
- quartz /
- electron spin resonance (ESR) /
- dose /
- irradiation /
- stability

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