RAD7测氡仪测量结果差异的探讨  

Discussion on the Differences of Continuous Radon Measurement Results by RAD7 Detector in Different Working Modes

作　　者：张学礼[1] 牛洁[1] 徐乐昌[1] 彭阳[1] 康剑翘[1] Zhɑnɡ Xueli;Niu Jie;Xu Lechɑnɡ;Penɡ Yɑnɡ;Kɑnɡ Jiɑnqiɑo(Beijing Research Institute of Chemical Engineering and Metallurgy, CNNC, Beijing 101149, China)

机构地区：[1]核工业北京化工冶金研究院,北京101149

出　　处：《核安全》2018年第2期78-88,共11页Nuclear Safety

基　　金：环境保护部核与辐射安全监督管理;项目编号:DC201619-调查1630

摘　　要：为确保环境氡浓度监测结果可靠,探讨RAD7测氡仪在不同工作模式下连续监测结果之间的差异是十分必要的。根据RAD7在不同工作模式下的测氡原理,利用正常模式下的氡浓度监测数据,提出了吸气模式下的氡浓度计算公式,并对这两种模式下所得结果进行了比较分析。结果表明,在100 Bq·m^(-3)左右氡浓度水平下单一测量周期时间内,两种模式所得氡浓度的最大相对偏差接近60%;当连续监测时间短于6 h,两种模式测量结果的相对合成扩展不确定度均超过25%,不能满足相关标准要求;当连续监测时间超过12 h,两种模式之间氡浓度均值差异没有统计学显著性(p>0.05)。为缩小不同工作模式下RAD7测量结果差异,设置合适的连续监测时间并采用氡浓度均值无疑是较好的办法。In order to ensure that the monitoring results of radon concentration in the air are reliable,it is necessary to discuss the differences of the continuous monitoring results obtained by RAD7 radon detector in different working modes. According to the principle of radon measurement using RAD7 in different working modes,the calculation formula of radon concentration in sniff mode is given based on the monitoring data of radon concentration from normal mode,and the results obtained in the two working modes are compared and analyzed. The results show that the differences of radon concentration indoor at the level of about 100 Bq·m-3 between normal mode and sniff mode are significant during a single cycle period,with the maximum relative deviation of nearly 60%. When the continuous monitoring time is shorter than 6 hours,the uncertainty of measurement results in the two working modes is more than 25%,which could not meet the requirements of the relevant standards. When the continuous monitoring time exceeds 12 hours,there are no statistically significant differences（ p 〉0. 05） in radon concentration means between normal mode and sniff mode. It could be a better solution by setting the appropriate continuous monitoring time and adopting the mean value of radon concentration to reduce the differences of measurement results obtained by RAD7 in different working modes.

关 键 词：氡浓度 RAD7测氡仪 连续监测 

分 类 号：TL751[核科学技术—辐射防护及环境保护]