α放射性气溶胶监测仪检测下限研究

Study on Minimum Detectable Limit of α Radioactive Aerosol Monitoring Equipment

针对能量甄别法,通过理论推导的方法建立了检测下限和探测器探测效率、采样测量时间、设备采样速率、天然氡子体浓度等因子的数学关系,分析各影响因子以研究检测下限。结果表明,提高探测效率、加快设备采样速率、增长采样探测时间、降低天然氡子体浓度等条件下,均可降低设备的检测下限。

Minimum detectable limit is one of important indexes measuring the characteristic of method to evaluate the radioactive aerosol of monitoring equipment. Through the method of energy-absorbing steering assembly discrimination,based on theoretical derivation,the mathematical relation between the minimum detectable limit and detector efficiency,equipment sampling rate,natural radon daughters concentration were established. Each influencing factor was analyzed to study their minimum detectable limit. Results showed that improving detection efficiency,accelerating sampling rate,prolonging detection time and lowering natural radon daughters concentration can all lower the minimum detectable limit. The results can provide reference for optimizing the radioactive aerosol monitoring equipment.