CAJ | 학술논문

为满足脉冲中子探测系统对辐射屏蔽的要求，在利用MCNP程序模拟计算准直孔分别为圆柱形直孔和锥形孔的屏蔽效果基础上，设计了圆柱形直孔＋锥形孔的准直器结构，准直器采用铁35 cm厚＋聚乙烯20 cm厚＋铅15 cm厚的组合材料。理论计算表明：该准直器用于反冲质子探测系统时，探测系统输出信号与干扰信号的比值大于10。
위만족맥충중자탐측계통대복사병폐적요구，재이용MCNP정서모의계산준직공분별위원주형직공화추형공적병폐효과기출상，설계료원주형직공＋추형공적준직기결구，준직기채용철35 cm후＋취을희20 cm후＋연15 cm후적조합재료。이론계산표명：해준직기용우반충질자탐측계통시，탐측계통수출신호여간우신호적비치대우10。
It is very important to design collimator to reduce the radiation background.A collimator design for a pulsed neutron flux measurement to reduce background is investigated in this paper.The shading effects of round shaded hole and coned-shaded hole have been simulated by MCNP.The collimator structure,which is a combination of round shaded hole and coned-shaded hole,has been design to be composed of a combination of 35 cm thick iron,20 cm thick polyethylene and 15 cm thick lead.The ratio of signal current and background current is calculated to be larger than 10 when this collimator is used for the recoil proton detection system.