摘要
为了满足用户对辐射场的特殊要求,需要进一步提高CFBR-II堆的n、γ比值。利用铅对γ射线良好的屏蔽作用,设计了基于铅为主体材料的调节器。通过理论计算,给出了添加不同厚度铅后的n、γ比值。综合考虑调节器对中子能谱的影响以及装置平台承重能力的影响后,实际加工了由每层厚度为1 cm,共4层组成的调节器,并进行了实验测量。结果表明:实验结果与计算结果在许可误差范围内符合。CFBR-II堆辐射场的n、γ比值在1.07×1012～4.87×1012 cm-2.Gy-1(Si)范围内可调。
In oder to satisfy the spcial demand of some users on the radiation field, it is necessaary to further increase the n/γ value（neutron-fluence-to-gamma-ray dose ratio） in CFBR-Ⅱ. The regulator with Pb as the main material is designed, considering its well shielding capability to gamma-ray. The n/γ values with different lead thickness have been given from theory calculation. Considering the effect of regulator on the neutron spectrum and the load capacity of the installation platform, the regulator consisted of 4 layers （lcm for each layer） is worked out, and the experimental measurements have been carried out. The results indicate that the experimental results accord with the calculational one within allowable error range. The n/γ value in CFBR-Ⅱ radiation field can be regulated within 1.07× 10^12cm^-2 · Gy^-1 to 4.87× 10^12cm^-2· Gy^-1.
出处
《核动力工程》
EI
CAS
CSCD
北大核心
2008年第6期102-105,共4页
Nuclear Power Engineering
关键词
混合辐射场
中子注量
吸收剂量
屏蔽能力
Complicated radiation field, Neutron flux, Absorption dosage, Shielding capability
