塑料闪烁体用于鉴别γ放射性人工核素

γ radioactive man-made isotopes verification based on plastic scintillator

基于塑料闪烁体与γ射线的特殊作用,该文开展能量窗口法用于塑料闪烁体人工核素鉴别技术的研究。首先搭建基于塑料闪烁体的快速鉴别测量系统,使用人工放射性核素137Cs,60Co,241Am和天然放射性核素232Th 4种标准源对系统能量窗口进行刻度和计数分布实验,研究塑料闪烁体与γ射线作用时的脉冲分布和鉴别算法。在实验的基础上,使用γ总计数算法和能量窗口软件算法设计探测系统。测试结果表明:采用该算法的测量系统可以快速准确地从本底和天然放射性核素中鉴别出γ人工放射源。

Plastic scintillators are mostly used as gammacounters because of their poor energy resolution. However,an energy windowing（EW） algorithm can perform rough nuclide identification with the spectral occupied from it.This paper has described the setup of a plastic scintillator-based measurement system to verify γ radioactive man-made isotopes using the EW algorithm.Discriminators are calibrated with standard sources137 Cs,60Co,241 Am and naturalradioactive nuclides232 Th. Experiments are conducted to study the scale and count rate distribution of the EW window. After that,the count rate algorithm and the EW algorithm software are designed and used in PC. The results show that this system can quickly and accurately distinguish man-made radiation sources from background and naturally occurring radioactive materials.