用于反应堆安全壳内氟-18探测器的校准及影响因素  

Calibration of fluorine-18 detector in atmosphere radiation monitor installed in the containment of nuclear reactor and the influencing factors

作　　者：忻智炜 韩刚 陆小军[1] Xin Zhiwei;Han Gang;Lu Xiaojun(Shanghai Institute of Measurement and Testing Technology)

机构地区：[1]上海市计量测试技术研究院

出　　处：《上海计量测试》2022年第4期20-22,26,共4页Shanghai Measurement and Testing

摘　　要：安装于核反应堆安全壳内的大气辐射监测仪的氟-18探测器采用γ-γ符合测量原理,连续监测气溶胶中氟-18的活度水平。其主要计量特性为活度响应及其非线性,采用氟-18参考源进行校准,活度响应以探测器γ-γ符合计数率与氟-18参考源的活度之比表示。在5.5~25 kBq的活度范围内,非线性可忽略,氟-18参考源中氟-18核素分布均匀性影响活度响应测量的复现性;立体角的变化是影响活度响应校准结果的主要因素。The fluorine-18 detector of the atmospheric radiation monitor installed in the containment of the nuclear reactor uses the γ-γ coincidence principle to continuously monitor the fluorine-18 activity level in the aerosol. Its main metrological characteristics are activity response and its nonlinearity. Fluorine-18 reference source is used for calibration. The activity response is expressed by the detector γ-γ coincidence count rateto the fluorine-18 reference source activity. In the activity range of(5.5-25) k Bq, the non-linearity can be ignored, and the uniformity of the distribution of fluorine-18 nuclides in the reference source affects the reproducibility of the activity response measurement;the change of solid angle is the main factor affecting the calibration result of activity response.

关 键 词：氟-18探测器 安全壳 活度响应 氟-18参考源 

分 类 号：TL364.3[核科学技术—核技术及应用] TM623[电气工程—电力系统及自动化]