光纤传输型便携式大面积表面污染监测仪实验样机的性能测试与分析  

Performance Test and Analysis to the Prototype of Fiber-based Portable Large Area Surface Contamination Monitor

作　　者：曲延涛[1] 侯杰[2] 刘阳[1] 王薇[1] 王莹[1] 

机构地区：[1]中国原子能科学研究院,北京102413 [2]环境保护部核与辐射安全中心,北京100082

出　　处：《辐射防护》2013年第6期334-339,共6页Radiation Protection

基　　金：国防科工局核能开发项目

摘　　要：研究了基于大面积塑料闪烁体(灵敏面积高达1 200 cm2),利用波长转换光纤(WLS)开展β表面污染测量的可行性。初步采用了波长转换光纤阵列与塑料闪烁体直接耦合的设计方式。基于该设计,编制了计算程序,开展了系统的光传输模拟计算,对塑料闪烁体尺寸、波长转换光纤的数量和排布方式进行了优化设计。同时,结合分析结果完成了测量系统的整体设计,加工制作了专门的实验样机,并对该装置进行了性能测试。结果表明:该实验样机的灵敏探测面积为1 200 cm2、探测效率约为15.4%、不同灵敏区域的不均匀度约为9.7%、探测下限约为0.05 Bq/cm2,可以满足正常运行和事故情况下的β表面污染监测需求。The feasibility was studied of using large area plastic scintillation （sensitive area up to 1 200 c㎡） and wavelength-shifting fiber （WLS） to measure 15 surface contamination that led to a tentative adoption of direct coupling method of wavelength-shifting fiber array and plastic scintillator. Based on above, a calculation program was established, by which the optical transmission was simulated enabling optimizations to the design of the system such as the size of the plastic scintillator, the quantity of the wavelength-shifting fiber and the configuration mode of the wavelength-shifting fiber. As a result, a special experimental prototype was developed and tested. Results prove that the sensitive detection area is up to 1 200 c㎡, the detection efficiency is about 15.4% , the inconsistency of the different sensitive area is about 9.7% , and the minimum detectable limit is about 0.05 Bq/cm2, all of which indicate that the experimental prototype could satisfy requirements of surface pollution monitoring for both normal and accident conditions.

关 键 词：塑料闪烁体 波长转换光纤 β表面污染 

分 类 号：TL81[核科学技术—核技术及应用]