On‐the‐Fly Calculation of Absorbed and Equivalent Atmospheric Radiation Dose in A Water Phantom with the Atmospheric Radiation Interaction Simulator (AtRIS)
On‐the‐Fly Calculation of Absorbed and Equivalent Atmospheric Radiation Dose in A Water Phantom with the Atmospheric Radiation Interaction Simulator (AtRIS)
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DOI：
10.1029/2019ja026622
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发表时间：
2019-12
期刊：
影响因子：
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通讯作者：
S. Banjac;B. Heber;K. Herbst;L. Berger;S. Burmeister
中科院分区：
文献类型：
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作者：
S. Banjac;B. Heber;K. Herbst;L. Berger;S. Burmeister
由于与探测系外行星上生命的痕量气体或计算地球大气中任意高度的剂量率相关的几个原因，计算高能粒子在任意（系外）行星大气中的电离和辐射剂量最近变得越来越重要。我们之前介绍了大气辐射相互作用模拟器，这是一个新的基于Geant 4的代码，专门用于通过系外行星大气进行辐射传播的参数研究（Banjac等人，2019 https：//doi.org/10.1029/2018JA026042）。其中，离子-电子对产生率的计算，这是化学和大气建模的强制性输入，已经提出并验证了地球测量和其他类似的，但太阳系特定的基于Geant 4的代码（PLANETOCOSMICS）。除了为系外行星的大气建模提供输入外，AtRIS还旨在通过计算吸收剂量来直接表征可居住性。在这项技术验证研究中，在显示了对大气辐射的次级粒子的详细分析之后，我们描述了代码的一个功能，该功能使得入射辐射的相互关系的直接参数研究和整个大气中产生的吸收剂量成为可能。在使用NRLMSISE-00获得的大气模型和使用最近改进的力场方法计算的初级质子和氦GCR通量配置的验证案例研究中，我们将模拟结果与飞行辐射环境探测器（FRED）获得的测量结果进行了比较。我们表明，大气辐射相互作用模拟器（AtRIS）可以重现测量的剂量率依赖于高度。
Computation of the ionization and radiation dose in arbitrary (exo‐) planetary atmospheres due to energetic particles is recently becoming more important due to several reasons that are either correlated with the detection of trace gases for life on exoplanets or with computing dose rates at arbitrary altitudes in the Earth atmosphere. We previously presented Atmospheric Radiation Interaction Simulator, a new Geant4‐based code tailored specifically to enable parametric studies of radiation propagation through exoplanetary atmospheres (Banjac et al., 2019 https://doi.org/10.1029/2018JA026042). Therein, the calculation of ion‐electron pair production rates, which are a mandatory input for chemical and atmospheric modeling, has been presented and validated against Earth measurements and also other, similar, but solar‐system‐specific Geant4‐based codes (PLANETOCOSMICS). In addition to providing input for atmospheric modeling of exoplanets, with AtRIS we aim to directly characterize the habitability by calculating the absorbed dose. In this technical validation study, after showing a detailed analysis of the secondary particles contributing to the atmospheric radiation, we describe a feature of the code which makes direct parametric studies of the interrelation of incident radiation and the resulting absorbed dose throughout the atmosphere possible. In a validation case study configured using an atmospheric model obtained with NRLMSISE‐00 and a primary proton and helium GCR flux calculated using a recent improvement of the force‐field approach, we have compared simulation results with measurements obtained with the Flight Radiation Environment Detector (FRED). We show that Atmospheric Radiation Interaction Simulator (AtRIS) can reproduce the measured dose rate dependence on altitude.