α放射性气溶胶快速监测仪响应时间的研究

摘要

Energy discrimination is an important method to eliminate the interference of measurement caused by natural radioactivity.Through the methods of theoretical derivation as well as numerical calculation,the article established the relationships between responding rime of radioactive aerosol monitor with equalization coefficient K,instrument detecting efficiency,sampling flow,detection limit as well as the concentration of radon daughter.Results show that responding time of radioactive aerosol monitor can be shorten by decreasing equalization coefficient K,improving instrument detecting efficiency,increasing sampling flow,raising detection limit of artificial radioactive aerosol and lowering concentration of natural radioactive aerosol.This is beneficial to optimizing the design of radioactive aerosol monitor.%能量甄别法是消除天然放射性对测量干扰最常用的方法之一.通过理论推导和数值计算的方法建立了补偿系数K、仪器探测效率、取样流量、探测下限及环境中天然氡子体浓度与放射性气溶胶监测仪响应时间的关系.结果表明,减小补偿系数K,提高探测效率,增大取样流量,提高人工放射性气溶胶探测下限,降低天然放射性气溶胶浓度,均可缩短仪器的响应时间.结果可为设计优化放射性气溶胶监测装置提供参考.