强激光与粒子束2017，Vol.29Issue(12)：111-116,6.DOI:10.11884/HPLPB201729.170225
2.45MeV小型D-D中子管准直屏蔽结构设计
Design of alignment and shielding structure for small D-D neutron tube with 2.45 MeV neutron source
吕汶辉 1过惠平 1吕宁 1侯毅杰 1王晓添 1赵括 1田晨扬1
作者信息
- 1. 火箭军工程大学核工程系,西安 710025
- 折叠
摘要
Abstract
In order to obtain a small angle monoenergetic neutron source,the Monte Carlo software is used to design the shield collimating structure of the small 4π neutron source with energy of 2.45 MeV produced by a D-D neutron tube.The shield collimating structure is divided into a collimator and a capture cave.The collimator is made of three layers of iron,boron containing polyethylene and lead,which is used to shield the stray neutrons from the irradiation outside.The main function of the capture cave is to increase the number of elastic scattering in the opposite direction,thus reducing the proportion of the low energy scattered neutrons.The optimum thickness of the material and the size of the aperture and the optimum structure of the capture cave are obtained by MCNP simulation.Finally it is proved that the neutron flux of neutrons with 2.45 MeV energy in the radiation field is three orders of magnitude higher than that outside the radiation field.The low energy neutron flux in the radiation field is one order lower than the 2.45 MeV neutron flux,the total dose rate of both neutron and gamma outside the walls is below 2.5 μGy/h.This research has practical value for small angle neutron source with single energy,and it has important significance for the study of the verification of validity of neutron dosimeter and performance test of neutron monitor.关键词
D-D中子管/蒙特卡罗/准直器/捕获穴/设计Key words
D-D neutron tube/Monte Carlo/collimator/capture cave/design分类
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吕汶辉,过惠平,吕宁,侯毅杰,王晓添,赵括,田晨扬..2.45MeV小型D-D中子管准直屏蔽结构设计[J].强激光与粒子束,2017,29(12):111-116,6.
