使用闪烁光纤阵列探测器测定饮用水中的总β
Gross beta determination in drinking water using scintillating fiber array detector.
作者信息
Lv Wen-Hui, Yi Hong-Chang, Liu Tong-Qing, Zeng Zhi, Li Jun-Li, Zhang Hui, Ma Hao
机构信息
Key Laboratory of Particle and Radiation Imaging (Ministry of Education) and Department of Engineering Physics, Tsinghua University, Beijing 100084, China; Xi'an Research Institute of Hi-Tech, Xi'an 710025, China.
Key Laboratory of Particle and Radiation Imaging (Ministry of Education) and Department of Engineering Physics, Tsinghua University, Beijing 100084, China.
出版信息
Appl Radiat Isot. 2018 Jul;137:161-166. doi: 10.1016/j.apradiso.2018.04.007. Epub 2018 Apr 4.
A scintillating fiber array detector for measuring gross beta counting is developed to monitor the real-time radioactivity in drinking water. The detector, placed in a stainless-steel tank, consists of 1096 scintillating fibers, both sides of which are connected to a photomultiplier tube. The detector parameters, including working voltage, background counting rate and stability, are tested, and the detection efficiency is calibrated using standard potassium chloride solution. Water samples are measured with the detector and the results are compared with those by evaporation method. The results show consistency with those by evaporation method. The background counting rate of the detector is 38.131 ± 0.005 cps, and the detection efficiency for β particles is 0.37 ± 0.01 cps/(Bq/l). The MDAC of this system can be less than 1.0 Bq/l for β particles in 120 min without pre-concentration.
为监测饮用水中的实时放射性，研制了一种用于测量总β计数的闪烁光纤阵列探测器。该探测器置于不锈钢罐中，由1096根闪烁光纤组成，光纤两侧均连接到光电倍增管。测试了探测器的工作电压、本底计数率和稳定性等参数，并使用标准氯化钾溶液校准了探测效率。用该探测器对水样进行测量，并将结果与蒸发法的测量结果进行比较。结果表明与蒸发法的结果一致。探测器的本底计数率为38.131±0.005 cps，β粒子的探测效率为0.37±0.01 cps/(Bq/l)。该系统对于β粒子的最低可探测活度浓度（MDAC）在无需预浓缩的情况下，120分钟内可小于1.0 Bq/l。
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