新型放射性气溶胶连续监测仪的研制

摘要

针对环境低水平气溶胶连续监测中常常遇到的问题和难点，本项目采用自主研发的一种新型薄膜滤纸，及一种双工位取样测量装置（中国实用新型专利），并采用甄别能量的假符合方法（中国发明专利）等关键技术，研发了一种新型气溶胶连续监测仪。该仪器主要性能指标突出表现为其探测下限：当氡浓度最高为102～103 Bq／m3时，对铀和钚的探测下限可达到0．05～0．08 Bq／m3，对β的探测下限为5～10 Bq／m3，最长测量时间为40～60 min，并且能实现实时在线连续监测。因此，该仪器可用于地下洞库或坑道内高氡环境中，快速准确并连续测量出低水平气溶胶浓度，也可用于核电站、放射性工作场所、核事故应急以及气态排出流中放射性气溶胶的快速连续监测。%Regarding the problem and the difficulty of environment low radiation level aerosol continuous monito -ring , this project developed a kind of new membrane filter paper , and a device for sampling and measuring with double working positions ( a Chinese patent for utility models ) , and adopted some key technoligies like a spuri-ous coincidences method of screening energy ( a Chinese invention patent ) , and also developed a kind of new radioactive aerosol continuous monitoring instrument .One of the key performance indexes of the instrument is the low limit of detection:with the highest radon concentration at 102 ~103 Bq/m3 , the low limit of detecting u-ranium and plutonium would be at 0.05~0.08 Bq/m3 , and the low limit of detecting βwould be at 5~10 Bq/m3 , and the longest time of measuring is 40 min-60 min.Meanwhile, this instrument can continuously monitor online .Consequently , it can be used in the underground storage cavernes and tunnels with high level of radon concentration to monitor the low level of the aerosol concentration rapidly and precisely and continuously , and also it can be used in nuclear power station , radioactive workplace , and all of the places , monitoring the aerosol concentration rapidly and continuously from nuclear accident emergency and gaseous effluents .