在线式放射性液态流出物监测仪研制

On line continuous liquid radioactive effluent monitoring

本文针对核设施中液态流出物关键伽马核素60 Co、137 Cs的测量,采用自主专利等多项技术设计样机,基于NaI(Sodium Iodide)闪烁体探测器的自动核素识别,开发了探测灵敏度更好、质量更轻便且满足通用的建筑承载能力的在线式液态流出物监测装置。设计加工集成的样机经过能量刻度、效率刻度、感兴趣区自动划分核素识别测试,并通过国家一级计量站校准测试,经过超过500多小时实验,其性能稳定可靠,具有核素识别能力,测试显示60 Co、137 Cs探测限小于0.088 Bq/L。对比国内传统监测技术,质量减轻接近1个数量级,探测灵敏度提升超过2个数量级,监测技术及其样机从技术能力而言也适用于饮用水伽马关键核素活度浓度监测。

In this paper,a radionuclide identification continuous liquid radioactive effluent prototype monitor based on NaI detector was developed based on indigenous patent methods for the measurement of the key gamma radionuclide such as 60 Co,137 Cs in nuclear facilities.The monitor had been tested for more than 500 hours.Results showed it is stable and reliable,and has the ability of radionuclide identification.Through the national level Laboratories verification of the efficiency and 500 hours test,the detection limit of continuous liquid radioactive effluent monitor was achieved around 0.088 Bq/L.The results showed that it improves the detection limit nearly two orders of magnitude lower and the weight decreased one order of magnitude lower.The device can also be applied to monitor key gamma nuclides activity concentration in drinking water.This study has important reference value for the detection of effluent.And the developed instrument could be easier for radiation controlling monitoring because of the lower installation conditions requirements than traditional instruments.