塑料闪烁体β气溶胶连续监测仪MDA计算分析

Calculation and Analysis on MDA of Plastic Scintillator β-aerosol Continuous Monitor

最小可探测活度浓度(MDA)为放射性气溶胶连续监测仪的重要性能指标。通过理论推导和数值计算的方法,建立了基于塑料闪烁体的β气溶胶连续监测仪MDA的计算方法,并分析了各因素对MDA的影响。计算结果表明,降低本底水平、增加测量时间或增大取样流量,均可降低监测仪的MDA。该计算方法可为塑料闪烁体β气溶胶连续监测仪在设计和使用过程中的MDA计算及优化提供参考依据。

The minimum detectable activity concentration(MDA)is an important performance index of radioactive aerosol monitor.The calculation method of MDA of the plastic scintillator β-aerosol continuous monitor has been established through theoretical derivation and numerical calculation,and the influence of each factor has been analyzed.Result shows that MDA can be lower by decreasing the environmental background,increasing the measurement time and increasing the sampling flow.This calculation process is beneficial for the MDA calculation and optimization in the design and use of the plastic scintillator β-aerosol continuous monitor.