月球上的中子和马射线的全球剂量分布
Masayuki Naito1, Hiroki Kusano1, Satoshi Kodaira2
1National Institutes for Quantum Science and Technology (QST), 4-9-1 Anagawa, Inage, Chiba, 263-8555, Japan.
Scientific reports
|August 15, 2023
概括
月球表面辐射剂量率,包括中子和马射线,因地质特征而异. 这项研究有助于选择安全的长期载人任务地点,并制定辐射保护战略.
科学领域:
- 太空辐射物理学 太空辐射物理学
- 月球地质学 月球地质学
- 天体生物学 天体生物学
背景情况:
- 长期载人月球任务需要精确的辐射剂量评估.
- 太空辐射包括银河系宇宙射线 (GCR),以及由月球表面相互作用产生的二次中子和马射线.
- 月球上的天然放射性核素也会对辐射环境产生影响.
研究的目的:
- 评估月球表面中子和玛射线环境剂量分布.
- 为了将剂量率与月球的地质特征和放射性元素分布相关联.
- 为未来的月球任务提供网站选择和辐射保护策略的信息.
主要方法:
- 利用Geant4蒙特卡罗模拟进行辐射传输建模.
- 综合卡古亚马射线光谱仪数据 (2009年2月至5月) 用于验证.
- 分析了基于月球地质组成的剂量变化,包括富含铁和的马地区.
主要成果:
- 中子子剂量率在每年58.7-71.5mSv之间,在基岩丰富的马地区更高.
- 马射线剂量率在3.33-3.76mSv/年之间,与自然放射性元素 (U,Th,K) 相对应.
- 由GCR诱导的二次马射线贡献了~3.4mSv/年,增加了12-15%的初级GCR剂量.
结论:
- 月球的地质特征显著影响中子和马射线剂量速率.
- 了解这些剂量分布对于确定长期月球居住的安全区域至关重要.
- 这些发现支持未来月球宇航员开发有效的辐射屏蔽和任务规划.
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