蒙特卡罗方法研究塑料闪烁探测器加权积分法测量H′(0.07)  

Study on a weighted integration method for measuring H′ (0.07) using plastic scintillator by Monte Carlo method

作　　者：刘立业[1] 马吉增[1] 李君利[2] 

机构地区：[1]中国辐射防护研究院,山西太原030006 [2]清华大学工程物理系,北京100084

出　　处：《核电子学与探测技术》2005年第2期127-130,186,共5页Nuclear Electronics & Detection Technology

摘　　要：对弱贯穿辐射场定向剂量当量H′(0.07)的现有测量方法进行了讨论,提出塑料闪烁探测器加权积分法测量H′(0.07)。采用蒙特卡罗方法对脉冲计数法和加权积分法塑料闪烁探测器的能量响应进行了对比计算;在此基础上引入了作用于沉积能谱的加权函数G(E)以进一步改善探测器的能量响应。利用90Sr-90Y、147Pm、204Tl放射源的初步实验结果证实,采用加权积分法后塑料闪烁探测器对上述放射源的能量响应在6%范围内。对塑料闪烁体发光非线性、切伦可夫辐射等实验影响因素作了初步讨论。Current methods for H′ (0.07) measurement are discussed in this paper. A weighted integration method using plastic scintillator detector is introduced. The comparison of energy responses of pulse counting method and pulse height integration method using plastic scintillator are studied by Monte Carlo calculation. Analysis of the deposited energy spectra to electrons with different incident energies shows that a weighted function can be used to obtain a flat energy response for electrons at low energy region. The preliminary experiment was finished with three beta sources (()^(90)Sr-()^(90)Y, ()^(147)Pm, (()^(204)Tl)), and constant response within 6% is confirmed. Some problems, which may cause uncertainty errors to measurement accuracy, are also discussed in the paper.

关 键 词：闪烁探测器 能量响应 塑料闪烁体 放射源 蒙特卡罗方法 实验结果 能谱 积分法 加权 贯穿 

分 类 号：TL812[核科学技术—核技术及应用] TL814