空气产生的次级电子对有机薄膜闪烁体伽马响应的影响

【作者】 陈亮； 欧阳晓平； 张忠兵； 张显鹏；

【机构】 西北核技术研究所；

【摘要】 由于薄膜闪烁体对电子的响应较伽马灵敏几个量级,以薄膜闪烁体为辐射灵敏单元的探测器伽马灵敏度受空气散射次级电子影响干扰突出。利用MCNP程序对存在及不存在空气条件下的薄膜闪烁体伽马响应进行了模拟计算,发现薄膜闪烁体越薄受空气的影响越突出,且随伽玛能量增大而增大。在钴60伽马源上对薄膜闪烁体进行了1.25MeV伽马响应的实验验证,比较了真空及非真空条件下空气影响对不同厚度薄膜闪烁体伽马响应的影响,实验结果与理论一致。更多还原

【Abstract】 As the sensitivity of film scintillator to electrons is magnitudes higher than to gamma,detectors make use of film scintillator as radiation transformer suffered greatly from sub electrons produced by air dispersion.Energy deposited in the film scintillator while gamma incident vertically was simulated by MCNP program,under vacuum and with air respectively.It is found that the percentage of air interference increases with gamma energy,and increases while the film become thinner.The air interference was validated upon ⁶⁰Co gamma source.Sensitivities of film scintillators with different thickness was measured with and without vacuum respectively,and the result agreed well with the theory.更多还原