摘要
水体放射性自动监测站的高纯锗γ能谱连续监测系统的分析对象是动态的环境水样。使用蠕动泵模拟水体流动,通过实验测量高纯锗γ能谱对不同流速、不同浓度^(40)K溶液的探测效率,实验的流速范围为0~10 L/min、^(40)K活度浓度范围为10.4~520 Bq/L,测得效率未见显著变化,据此,可将标准溶液密封在测量容器中作静态测量效率刻度,而无需采用模拟液体流动的模式。由无源效率刻度软件(Angle V4)计算探测效率与参考溶液效率测量结果比较,相对偏差范围为0.1%~9.4%,验证了使用无源效率刻度方法可行。
HPGe detecter usedin online waterγradioactivity measurement measures flowing environmental water.By using peristaltic pump to simulate water flowing,setting ^(40)K solutions with different flow rates(0-10)L/min and concentrations(10.4-520)Bq/L to measure the detection efficiency,no significant change is showed.The efficiency calibration can use the standard solution sealed in the measuring container instead of flowing water.The comparison between the detection efficiency calculated by the sourceless efficiency calibration software(angle V4)and the measurement results of the standard solution efficiency calibration shows that the relative deviation range is 0.1%-9.4%.The sourceless efficiency calibration methodis feasible.
作者
洪韵
Hong Yun(Shanghai Technology Center of Radiation Environment Safety)
出处
《上海计量测试》
2022年第1期10-14,共5页
Shanghai Measurement and Testing
基金
上海市科学技术委员会科技计划项目(21dz1200100)。
关键词
水体放射性
自动监测
高纯锗γ能谱
效率刻度
water radioactivity
online measurement
HPGe detecter
efficiency calibration
