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The Martian surface radiation environment; A Comparison of models and MSL/RAD measurements

火星表面における宇宙線環境; MSL/RAD測定と計算結果の比較

Matthi$"a$, D.*; Ehresmann, B.*; Lohf, H.*; K$"o$hler, J.*; Zeitlin, C.*; Appel, J.*; 佐藤 達彦; Slaba, T. C.*; Martin, C.*; Berger, T.*; Boehm, E.*; Boettcher, S.*; Brinza, D. E.*; Burmeister, S.*; Guo, J.*; Hassler, D. M.*; Posner, A.*; Rafkin, S. C. R.*; Reitz, G.*; Wilson, J. W.*; Wimmer-Schweingruber, R. F.*

Matthi$"a$, D.*; Ehresmann, B.*; Lohf, H.*; K$"o$hler, J.*; Zeitlin, C.*; Appel, J.*; Sato, Tatsuhiko; Slaba, T. C.*; Martin, C.*; Berger, T.*; Boehm, E.*; Boettcher, S.*; Brinza, D. E.*; Burmeister, S.*; Guo, J.*; Hassler, D. M.*; Posner, A.*; Rafkin, S. C. R.*; Reitz, G.*; Wilson, J. W.*; Wimmer-Schweingruber, R. F.*

2012年8月6日以降、Mars Science Laboratory (MSL)に搭載された複合型放射線検出器(RAD)を用いて火星表面による放射線環境の測定が続けられている。本研究では、GEANT4, PHITS, HZETRN/OLTARISなど様々なコードを用いて火星表面における放射線環境を推定し、その結果とRADによる測定値を比較した。その結果、計算結果は測定値と概ねよい一致を示すものの、場合によっては大きく解離することが分かった。また、RADのデータは放射線輸送計算について、最適なインプットパラメータや物理モデルの最適な選択に役立つことも確認された。今回の解析結果は、今後、有人火星ミッションを計画する際、その被ばく線量評価や宇宙機遮へい設計などに活用することができる。

The Radiation Assessment Detector (RAD) on the Mars Science Laboratory (MSL) has been measuring the radiation environment on the surface of Mars since August 6th 2012. In this work, several models such as GEANT4, PHITS, and HZETRN/OLTARIS are used to predict the radiation environment caused by galactic cosmic rays on Mars in order to compare and validate them with the experimental results. Although good agreement is found in many cases for GEANT4, PHITS and HZETRN/OLTARIS, some models still show large, sometimes order of magnitude, discrepancies in certain particle spectra. We have found that RAD data is helping make better choices of input parameters and physical models. These results help to predict dose rates for future manned missions as well as to perform shield optimization studies.

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パーセンタイル:3.61

分野:Astronomy & Astrophysics

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