Selection of Shadow Shielding Structure and Material for Space Reactor
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摘要: 空间堆对辐射屏蔽尺寸和重量要求苛刻，为寻找合适的屏蔽方案，需要对屏蔽材料、结构进行选型研究。本文首先介绍了国内外对空间堆屏蔽目标及限值的研究进展，基于反应堆屏蔽设计原理，针对不同应用场景抽象出平板模型和球模型，在不同设计目标下对不同材料的屏蔽性能进行分析，基于分析结果采用自动化优化工具对屏蔽方案进行选型，分析了各个方案的优缺点。结果表明，放射源的能谱、源的尺寸大小、屏蔽体离源的距离、不同的屏蔽设计目标都会影响屏蔽材料和结构的选择，需要根据应用需求进行筛选；碳化硼、氢化锂和钨是较好的空间堆屏蔽材料；利用自动化优化工具对屏蔽体进行分层布置可实现有效减重。Abstract: The space reactor has strict requirements on the size and weight of radiation shielding. In order to find out a suitable shielding scheme, it is necessary to select the shielding material and structure. In this paper, firstly, the research progress of shielding targets and limits of space reactors at home and abroad is introduced. Based on the design principle of reactor shielding, flat model and spherical model are abstracted for different application scenarios, and the shielding performance of different materials is analyzed under different design objectives. Based on the analysis results, automatic optimization tools are used to select shielding schemes, and the advantages and disadvantages of each scheme are analyzed. The results show that the energy spectrum of the source, the size of the source, the distance between the shield and the source, and different shielding design objectives will affect the selection of shielding materials and structures, which needs to be carried out according to the application requirements. Boron carbide, lithium hydride and tungsten are good shielding materials for space reactors, and the use of automatic optimization tools for layered layout of the shield can achieve effective weight reduction.
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图 4 材料在不同分析模型下的中子屏蔽性能
Figure 4. Neutron Shielding Performance of Materials under Different Analysis Models
图 5 球模型中中子通过不同6Li富集度氢化锂、不同10B富集度碳化硼的注量率随重量的变化
Figure 5. Variation of Fluence Rate of Neutron Passing Through Lithium Hydride (Different 6Li Enrichment) and Boron Carbide (Different 10B Enrichment) with Weight in Spherical Model
图 6 球模型中经过相同屏蔽重量后的中子能谱
Figure 6. Neutron Energy Spectrum with the Same Shielding Weight in Spherical Model
图 7 球模型中经过不同屏蔽重量后次生光子产生率
Figure 7. Generation rate of Secondary Photons with Different Shielding Weights in Spherical Model
图 8 材料在不同分析模型下的光子屏蔽性能
Figure 8. Photon Shielding Performance of Materials under Different Analysis Models
图 10 不同屏蔽指标与屏蔽体距放射源不同距离的关系
Figure 10. Relationship between Different Shielding Index and Different Distance from Shield to Source
图 11 聚乙烯+铅组合屏蔽结构示意图
Figure 11. Schematic Diagram of Polyethylene + Lead Combined Shielding Structure
图 12 碳化硼+氢化锂组合屏蔽结构示意图
Figure 12. Schematic Diagram of Boron Carbide + Lithium Hydride Combined Shielding Structure
表 1 美国和俄罗斯的空间堆屏蔽目标及限值
Table 1. U.S. and Russian Space Reactor Shielding Targets and Limits
反应堆 国别 年代 屏蔽目标 设计限值 SNAP-10A 美国 1958—1965 电子器件 1×104 Gy
1×1012 cm−2(En>0.1 MeV)TOPAZ-2 苏联/俄罗斯 1972—1992 18.5 m处用户平面 5×102 Gy
1×1011 cm−2
（等效1 MeV中子）SP-100 美国 1983—1990 22 m处用户平面 5×103 Gy
1×1013 cm−2
（等效1 MeV中子）Naval 美国 2002—2005 22 m处用户平面 5×103 Gy
1×1013 cm−2
（等效1 MeV中子）Kilopower 美国 2006— 10 m处用户平面 2.5×102 Gy
1×1011 cm−2(En>0.1 MeV)En—中子动能 
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表 2 不同电子器件抗中子辐照能力
Table 2. Resistance of Different Electronic Devices to Neutron Irradiation
器件类型 中子注量/cm−2 器件类型 中子注量/cm−2 低频晶体管 1010~1011 整流二极管 1013~1014 中频晶体管 1012~1013 稳压二极管 5×1013~5×1014 高频晶体管 1013~1014 隧道二极管 5×1014~5×1015 可控硅 <1013 逻辑电路 5×1013~1×1015 单结晶体管 5×1011~5×1012 继电器 6.5×1014 线性电路 5×1012 微波器件 1014~1015 结型场效应管 1014~1015 石英晶体 1013~1014 金属氧化物半导体场效应管 1014~1015 阻容元件 1015~1016 金属氧化物半导体电路 5×1014 电真空器件 1015~1017
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表 3 不同屏蔽方案的屏蔽效果
Table 3. Shielding Performance of Different Shielding Schemes
方案种类 屏蔽总
重/kg屏蔽体
厚度/cm中子注量率/
(cm−2·s−1)光子剂量率/
(Gy·s−1)聚乙烯+铅 61.2 62+5.6 3.0×106 3.0×10−3 聚乙烯+碳化硅 94.6 43+30.5 2.8×106 3.0×10−3 碳化硼 82.9 67.5 3.1×106 3.3×10−4 碳化硼+氢化锂 67.5 59+6 2.9×106 2.9×10−3 氢化锂+钨 53.9 53+5 3.2×106 2.9×10−3 氢化锂+碳化硅 85.1 34+34 3.0×106 3.1×10−3 氢化锆 106.3 51 2.8×106 1.4×10−4 氢化锆+氢化锂 46.4 26.5+28.5 3.1×106 2.9×10−3
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