中子屏蔽材料的实验评估

EXPERIMENTAL EVALUATION OF NEUTRON SHIELDING MATERIALS.

作者信息

Campo X, Méndez R, Lacerda M A S, Garrido D, Embid M, Sanz J

机构信息

esearch Centre for Energy, Environment and Technology, Av. Complutense 40, Madrid, Spain.

ational Distance Education University, Juan del Rosal, 12, Madrid, Spain.

出版信息

Radiat Prot Dosimetry. 2018 Aug 1;180(1-4):382-385. doi: 10.1093/rpd/ncx202.

DOI:10.1093/rpd/ncx202

PMID:29036700

Abstract

A new proposed design of neutron shielding material-based on the commercial material Borotron UH050 with an addition of Al(OH)3-is evaluated in order to determine if its neutron and gamma shielding properties match those of a reference material, NS4FR. Neutron and gamma dosimetry measurements are performed, as well as neutron spectrometry measurements and Monte Carlo simulations. Negligible differences are found between the materials for neutron shielding, while significant differences are found for gamma shielding. The effect of Al(OH)3 addition to Borotron UH050 is to reduce neutron shielding properties while increasing gamma shielding properties. The resulting material is as efficient as NS4FR for neutron shielding but less efficient for gamma shielding-thicknesses 20% higher are required to match gamma shielding properties of NS4FR. Monte Carlo models of the materials are validated based on the performed measurements of neutron spectra and neutron and gamma ambient dose equivalent.

摘要

为了确定一种基于商用材料硼特龙UH050并添加了氢氧化铝的新型中子屏蔽材料设计的中子和伽马屏蔽特性是否与参考材料NS4FR相匹配，对其进行了评估。进行了中子和伽马剂量测量，以及中子能谱测量和蒙特卡罗模拟。在中子屏蔽方面，两种材料之间的差异可忽略不计，而在伽马屏蔽方面则发现了显著差异。向硼特龙UH050中添加氢氧化铝的效果是降低中子屏蔽特性，同时提高伽马屏蔽特性。所得材料在中子屏蔽方面与NS4FR一样有效，但在伽马屏蔽方面效率较低——需要高出20%的厚度才能匹配NS4FR的伽马屏蔽特性。基于所进行的中子能谱以及中子和伽马环境剂量当量测量，对材料的蒙特卡罗模型进行了验证。