球状深穿透屏蔽基准实验设计及效果验证  

Experimental design of spherical deep penetration shielding benchmark and the effect verification

作　　者：翟梓安 唐松乾[1,2] 刘思凡 王湘雷 温兴坚 吴怡睿 ZHAI Zi′an;TANG Songqian;LIU Sifan;WANG Xianglei;WEN Xingjian;WU Yirui(National Key Laboratory of Nuclear Reactor Technology,Chengdu 610213,China;Nuclear Power Institute of China,National Key Laboratory of Nuclear Reactor Technology,Chengdu 610213,China)

机构地区：[1]中国核动力研究设计院核反应堆技术全国重点实验室,四川成都610213 [2]中国核动力研究设计院核动力设计研究所,四川成都610213

出　　处：《哈尔滨工程大学学报》2024年第12期2358-2363,共6页Journal of Harbin Engineering University

摘　　要：针对自主化屏蔽计算程序和屏蔽数据库缺少屏蔽基准实验数据验证的问题,本文基于Cf-252中子源开展了球状深穿透屏蔽基准系列实验设计研究,设计影锥系统解决深穿透屏蔽实验中散射扣除困难的关键问题。通过安装影锥系统前后的两次测量结果相减,从而实现散射中子的扣除。采用蒙特卡罗计算方法对影锥系统的应用效果进行了验证,并利用裸源实验完成了实验设计整体验证。结果表明:本文设计的影锥系统散射扣除效果良好,扣除后的探测器反应率较无散射情况的最大相对偏差为3.11%;裸源实验能谱测量结果与Cf-252自发裂变中子谱瓦特谱吻合良好,47群能谱的均方根误差为1.89×10-3。研究表明:本文开展的深穿透屏蔽基准实验设计效果较好,后续产生的实验数据可用于自主化屏蔽计算程序和屏蔽数据库的验证,支持我国深穿透屏蔽基准实验数据库建设。To address the lack of benchmark experimental data for verifying autonomous shielding calculation programs and databases,this study designed a series of spherical deep penetration shielding benchmark experiments using a Cf-252 neutron source.A shadow cone system was devised to address the critical challenge of subtracting scattered neutrons in these experiments.The scattering neutrons were effectively accounted for by comparing measurements taken before and after installing the shadow cone system.The Monte Carlo method confirmed the effectiveness of the shadow cone system,whereas the overall experimental setup was validated through tests with a bare neutron source.The results showed that the shadow cone system performed well in reducing scattering effects,with a maximum relative deviation of only 3.11%in the detector response after subtraction.The energy spectrum measurement results from the bare source experiment aligned closely with the watt spectrum of the spontaneous fission neutrons of Cf-252,achieving a root-mean-square error of 1.89×10-3 in the 47 energy group spectrum.In conclusion,the deep penetration shielding benchmark experiments successfully met their objectives.The experimental data generated will support the verification of autonomous shielding calculation programs and shielding databases,contributing to the development of a comprehensive deep penetration shielding benchmark database for China.

关 键 词：屏蔽计算 基准实验 散射扣除 影锥 深穿透 Cf-252 中子能谱探测器 蒙特卡罗计算 

分 类 号：TL71[核科学技术—辐射防护及环境保护]