Long-Term Variation of the Galactic Cosmic Ray Radiation Dose Rates

IF 3.7 2区 地球科学 Space Weather Pub Date : 2024-01-23 DOI:10.1029/2023sw003804
D. Lyu, G. Qin, Z.-N. Shen
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Abstract

In this work, a model for calculating the galactic cosmic rays (GCRs) radiation dose rate is developed. The model is based on a GCR modulation model, which is established by Shen and Qin, and the fluence-dose conversion coefficients (FDCCs) published by the International Commission on Radiological Protection (ICRP). With the model, the radiation absorbed dose rate of GCRs near the lunar surface over long time periods is calculated and compared with the observation data from the Cosmic Ray Telescope for the Effects of Radiation and the Lunar Lander Neutron and Dosimetry. First, the energy spectrum of GCRs at 1 AU in the ecliptic, where the lunar orbit is located, is computed using the GCR modulation model. Then, using the FDCCs of ICRP 123, the absorbed dose rates of 15 human organs/tissues at the lunar orbit position are calculated to represent the general absorbed dose rate of the body (in water). Furthermore, considering the albedo radiation (excluding neutrons) and using the water-silicon conversion coefficients, the total absorbed dose rates of GCRs near the lunar surface (in silicon) are calculated, it is shown that our modeling results generally agree with the observations from spacecraft. This work is useful for future manned space exploration to the Moon or other celestial bodies in the solar system.
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银河宇宙射线辐射剂量率的长期变化
本研究建立了银河宇宙射线辐射剂量率计算模型。该模型基于沈和秦建立的银河宇宙射线调制模型和国际辐射防护委员会(ICRP)公布的通量-剂量转换系数(FDCCs)。利用该模型,计算了月球表面附近长时段 GCR 的辐射吸收剂量率,并与宇宙线辐射效应望远镜和月球着陆器中子与剂量测定的观测数据进行了比较。首先,利用 GCR 调制模型计算了月球轨道所在黄道 1 AU 处的 GCR 能量谱。然后,利用 ICRP 123 的 FDCCs,计算月球轨道位置 15 个人体器官/组织的吸收剂量率,以表示人体(在水中)的一般吸收剂量率。此外,考虑到反照率辐射(不包括中子),并使用水-硅转换系数,计算了月球表面附近全球核辐射的总吸收剂量率(以硅为单位),结果表明我们的建模结果与航天器的观测结果基本吻合。这项工作对未来月球或太阳系其他天体的载人太空探索很有帮助。
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