Design of Regulator for n/γ in Complicated Radiation Field
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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。Abstract: In oder to satisfy the spcial demand of some users on the radiation field,it is necessaary to further increase the n/γvalue(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/γvalues 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(1cm 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/γvalue in CFBR-II radiation field can be regulated within 1.07×1012cm-2.Gy-1 to 4.87×1012cm-2.Gy-1.
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Key words:
- Complicated radiation field /
- Neutron flux /
- Absorption dosage /
- Shielding capability
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