γ放射性门式检测系统的蒙特卡罗模拟及设计  

Monte Carlo simulation and design of gantry system for γ radiation detection

作　　者：王琦标 庹先国[2,3,4] 黄红[1] 马桥[5] 王旭[1] 邓立[1] 杨剑波[1,2] 

机构地区：[1]成都理工大学地学核技术四川省重点实验室,成都610059 [2]成都理工大学地球探测与信息技术教育部重点实验,成都610059 [3]成都理工大学地质灾害防治与地质环境保护国家重点实验室,成都610059 [4]西南科技大学核废物与环境安全国防重点学科实验室,绵阳621010 [5]四川省疾病预防控制中心,成都610041

出　　处：《核技术》2015年第4期11-15,共5页Nuclear Techniques

基　　金：国家杰出青年科学基金(No.41025015);国家自然科学基金(No.41374112);国家863计划课题(No.2012AA063501);四川省科技创新苗子工程项目(No.2014-30)资助

摘　　要：针对γ放射源非法携带转移的危害性,设计了一种适用于放射性敏感区域的γ放射性门式检测系统。该系统首先采用塑料闪烁体探测器对放射性物质发出的γ射线进行甄别,然后采用Na I(Tl)探测器阵列进行核素识别和初步定位经137Cs和60Co两个常用γ放射源蒙特卡罗模拟验证,理论上其放射性检测下限可达370 Bq,并能有效地对放射性核素进行识别和初步模块化定位,对防止γ放射源的非法转移具有很好的技术途径。Background： The peaceful use of radioactive materials is a huge wealth for humans, but illegal transfer of radioactive materials brings a serious potential safety hazard to the public security. Purpose： This study aims to design a gantry system for γ radiation detection to avoid the illegal transfer of radioactive materials. Methods： MCNP code is used to simulate the system which measured two typical γ sources （137Cs and 60Co） using two plastic scintillator detectors （E J200） in the size of 200 cm×40 cm×6 cm. Nuclides are identified by analyzing the spectrum, and locations are obtained according to the response of NaI（T1） detector array. Results： Theoretical computation results showed that γ radiation detection limitation of this system was identified to be 370 Bq for both 137Cs and 60Co, characteristic peaks can be identified effectively, and locations of 137Cs are obtained rapidly and accurately. Conclusion： This system satisfies the use of crowd places well, and prevents γ radioactive sources from transferring illegally in the event of a nuclear accident.

关 键 词：γ放射性 门式检测系统 核素识别 定位 

分 类 号：TL99[核科学技术—核技术及应用]