静电收集法测量氡浓度的两种技术路线比较  

Comparison of Two Kind Technology Methods of Electrostatic Collection for Radon Measurement

作　　者：谭延亮[1,2] 肖德涛[2] 赵桂芝[2] 周青芝[2] 单健[2] 

机构地区：[1]衡阳师范学院物电系,湖南衡阳421008 [2]南华大学核科学技术学院,湖南衡阳421001

出　　处：《辐射防护》2011年第6期376-378,384,共4页Radiation Protection

基　　金：国家自然科学基金资助项目(编号:11075049);湖南省自然科学基金资助项目(编号:09JJ6007);湖南省研究生科研创新项目(编号:CX2010B373);衡阳师范学院英才支持计划;衡阳师范学院科学基金

摘　　要：基于静电收集法的连续测氡仪得到了广泛应用,但静电场对带正电的氡子体的收集效率受空气湿度的影响较大,因此该方法需要进行除湿或湿度修正。对这两种技术路线进行分析后发现:使用干燥管除湿可以很好的解决这一问题,且测量精度高,但是在相同的泵流率下干燥管的空隙体积增加了测量延迟效应;使用温、湿度曲线修正,会由于温、湿度的测量而导致附加的测量误差,但延迟效应较小,且有不需要更换干燥剂的优点,特别适合于无人值守时对氡浓度的长期连续测量。The continuous radon monitor,based on the electrostatic collection,has been widely used at present.However,the collection efficiency of the positively-charged radon progeny in the electrost aticfield is influenced by air humidity.By analyzing the two technical routes,we find that this problem canbe solved by using drying tubes and the measured value is of high accuracy,but the delay effect of measurement from the gap of the tube increase at the same pump flow rate.Using the temperature and humidity correction curve will lead to additional measurement error due to temperature and humidity measurement,but the delay time of measurement can be minor,and the desiccant does not need replacement.It is especially suitable for unattended long-term continuous measurement of radon concentration.

关 键 词：氡 静电收集法 干燥管 温、湿度修正曲线 

分 类 号：X837[环境科学与工程—环境工程]