摘要
本文介绍了利用MCNP/4C程序对聚乙烯和重金属结合慢化14MeV中子的慢化体结构进行模拟计算和分析。计算结果显示:三种重金属中铅对增加慢化体热中子注量率最好,铋次之,铁最差。模拟确定了空心圆柱慢化体的壁厚为14 cm。模拟结果证实了在源附近加5cm厚度的铅层,慢化体中引出孔热中子注量率最大,与全聚乙烯结构相比,可以把热化比降低三分之一左右,为实验确定慢化体结构提供了可靠的科学依据。
This paper introduced the combined moderator structure of high density polythene with high density metal are computed by using MCNP/4C program. The results show lead is the best capability for increasing fluenee rate of thermal neutron in the moderator, the second is bismuth, iron is the last. Comfirm the thick of column moderader is 14cm. The research also show that when add 5cm lead near the neutron generator may decrease the thermalization fator by one third compared with simple polythene and the fluenee rate of thermal neutron is the higher. It supplied a science basic for the design moderator structure.
出处
《核电子学与探测技术》
CAS
CSCD
北大核心
2008年第5期958-960,918,共4页
Nuclear Electronics & Detection Technology
关键词
蒙特卡罗
慢化体
热中子
注量率
Monte Carlo
moderator
thermal neutron
fluence rate
作者简介
王鑫（1982-），男，海南屯昌人，硕士研究生，粒子物理与原子核物理专业，主要从事中子射线应用和蒙特卡罗方法研究。
