大面积表面污染测量仪主要性能测试与分析  

The performance analysis of large area portable surface contamination survey meter

作　　者：张菁 侯磊 饶贤明[3] 刘晋瑾 杜向阳 张佳[1,2] 乔敏娟 ZHANG Jing;HOU Lei;RAO Xianming;LIU Jinjin;DU Xiangyang;ZHANG Jia;QIAO Minjuan(Shanxi Zhongfu Nuclear Instrument Co.Ltd.,Taiyuan 030006;China Institute for Radiation Protection,Taiyuan 030006;China Nuclear Xiapu Nuclear Power Co.Ltd.,Fujian Ningde 355100)

机构地区：[1]山西中辐核仪器有限责任公司,太原030006 [2]中国辐射防护研究院,太原030006 [3]中核霞浦核电有限公司,福建宁德355100

出　　处：《辐射防护》2020年第6期556-560,共5页Radiation Protection

摘　　要：针对用于测量α、β射线的便携式大面积表面污染测量仪,为确保其测量性能,本文根据JJG 478—2016和GB/T 5202—2008标准要求,对自主研发的便携式α、β大面积表面污染测量仪的均匀性、探测效率、探测限、响应时间和温度稳定性等主要性能指标进行了测试。结果表明:便携式大面积表面污染测量仪的表面发射率响应对241 Amα源为30.4%左右,对90 Sr-90 Yβ源为48.1%,对36 Clβ源为45.5%左右;最低可探测下限对241 Amα源为0.15 Bq/cm2,对β源90 Sr-90 Y为0.07 Bq/cm2,对β源36 Cl为0.09 Bq/cm2;响应时间<4 s;在-10℃~40℃时可正常工作。各项参数指标满足标准要求,能够有效达到防止污染扩散,保证工作人员安全的目的。Aiming at a large area portable surface contamination survey meter used in measuringα,βradiation,and ensuring the performance of measurement of the meter,the main performance of self-made instrument was measured based on JJG 478—2016 and GB/T 5202—2008 standards,including the uniformity of detector,surface emission rate response,minimum detectable limit,response time and temperature stability.The results show that the surface emission rate response of alpha for 241 Am is around 30.4%,of beta for 90 Sr-90 Y is around 48.1%,and of beta for 36 Cl is around 45.5%.The minimum detectable limit of alpha for 241 Am is 0.15 Bq/cm2,of beta for 90 Sr-90 Y is 0.07 Bq/cm2,and of beta for 36 Cl is 0.09 Bq/cm2.The response time is less than 4 s.The instrument can operate normally in the temperature range of-10℃to 40℃.These results are superior to the requirements of related standards and achieve the purpose of preventing the spread of radiation contamination to ensure the safety of field staff.

关 键 词：大面积表面污染测量仪 表面发射率响应 探测器的均匀性 

分 类 号：TL812[核科学技术—核技术及应用]