正比计数管探测低能X射线时探测效率的MC计算  

Efficiency Monte Carlo Calculation of Proportional Counter Tube for Low-energy X Ray Detecting

作　　者：张江云[1] 刘艳芳[1] 刘鹏[1] 于得军 黄宁[2] 

机构地区：[1]中国核动力研究设计院,成都610005 [2]四川大学原子核科学技术研究所,辐射物理及技术教育部重点实验室,成都610064

出　　处：《核电子学与探测技术》2016年第3期312-315,共4页Nuclear Electronics & Detection Technology

摘　　要：为研究各因子对正比计数管探测低能X射线时性能的影响，利用MCNP5软件计算了不同光子能量下管内气体种类、气体压强及壁效应、放置距离等因素对探测器探测效率的响应情况。结果表明正比计数管探测器对10～30keV X射线探测效率最佳；且在探测低能x射线时，正比计数管应尽可能靠近源项，同时管内最佳气体压强在1．515x10^5～2．02，X10^5Pa之间。To study the factors of proportional counter tube for detecting low - energy X ray, the MCNP5 was employed to calculate the response of gas type, gas pressure, wall effects and locations for different photon ener- gies detecting. The results show that the best detection efficiency obtained for X - ray within energy range of 10 -30 key and the optimum in - pipe gas pressure between 1.5x10^5 - 2.02 x 10^5 Pa. In order to measure higher detection efficiency, the detector should approach the source term as possible.

关 键 词：正比计数管 低能X射线 MCNP5 探测效率 

分 类 号：TL8[核科学技术—核技术及应用]