摘要
构建了煤质检测系统D-T中子源采用的3层屏蔽结构:第1层采用铁、不锈钢、钨等不同慢化材料,第2层采用含不同碳化硼质量分数的聚乙烯,第3层采用铅.利用MCNP5程序计算了不同屏蔽结构的中子透射率和中子占比.模拟结果表明:第1层为25cm厚钨,第2层采用含碳化硼质量分数为20%的15cm厚聚乙烯材料,第3层采用5cm厚铅,屏蔽效果最佳.
A three-layer shielding structure used in the D-T neutron source of the coal quality detection system was set up.The first layer was made of different slowing materials such as iron,stainless steel and tungsten.The second layer was made of polyethylene doped with different proportions of boron carbide.The third layer was made of lead.The neutron transmittance and neutron proportion of different shielding structures were calculated by using MCNP5 program.The simulation results showed that the first layer was 25 cm thick tungsten,the second layer was 15 cm thick polyethylene material with 20%mass fraction of boron carbide,and the third layer was 5 cm thick lead with the best shielding effect,respectively.
作者
庞敏
景士伟
PANG Min;JING Shi-wei(School of Physics,Northeast Normal University,Changchun 130024,China;National Demonstration Center for Experimental Physics Education(Northeast Normal University),Northeast Normal University,Changchun 130024,China)
出处
《物理实验》
2018年第7期8-13,共6页
Physics Experimentation
