α/β放射性气溶胶的小流量采样快速测量技术研究

Reaserch of a Method of Low Rate of Flow Sampling and Quick Survey for α/β Radioactive Aerosol Monitoring

针对放射性气溶胶监测仪的便携要求,设计了一套小流量采样快速测量系统和测量方法。采用累积采样累积测量的方式,联合利用能量甄别修正法与α/β比值法去除Rn子体的干扰,实现小流量采样条件下的α/β放射性气溶胶的同时监测。通过对探测下限的分析,表明该方法可满足应急监测的需求,为便携式α/β放射性气溶胶监测仪设计提供了参考。

Portability of radioactive aerosol monitor is required in some conditions, so a system and a method of low rate of flow sampling and quick survey have been designed in the article. The method of cumulative - sampiing and cumulative - measurement has been chosen. The method of corrected energy discrimination and 0./6 ratio have been used for reducing the effect of radon progeny and thoron progeny. So α/β activity concentration can be monitored quickly in condition of low rate of flow sampling. The detection limit of the system is ana- lysed, it is proved that the method has met some requirements of emergency response and been useful for design of portable radioactive aerosol monitor.