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Ray-tracing simulation of the radiation dose distribution on the surface of the spherical phantom of the MATROSHKA-R experiment onboard the ISS.
Life Sciences in Space Research ( IF 2.5 ) Pub Date : 2019-04-03 , DOI: 10.1016/j.lssr.2019.04.001
M I Dobynde 1 , F Effenberger 2 , D A Kartashov 3 , Y Y Shprits 4 , V A Shurshakov 3
Affiliation  

Space radiation is one of the main concerns for human space flights. The prediction of the radiation dose for the actual spacecraft geometry is very important for the planning of long-duration missions. We present a numerical method for the fast calculation of the radiation dose rate during a space flight. We demonstrate its application for dose calculations during the first and the second sessions of the MATROSHKA-R space experiment with a spherical tissue-equivalent phantom. The main advantage of the method is the short simulation time, so it can be applied for urgent radiation dose calculations for low-Earth orbit space missions.

The method uses depth-dose curve and shield-and-composition distribution functions to calculate a radiation dose at the point of interest. The spacecraft geometry is processed into a shield-and-composition distribution function using a ray-tracing method. Depth-dose curves are calculated using the GEANT4 Monte-Carlo code (version 10.00.P02) for a double-layer aluminum-water shielding. Aluminum-water shielding is a good approximation of the real geometry, as water is a good equivalent for biological tissues, and aluminum is the major material of spacecraft bodies.

The method is applied to model the dose distribution on the surface of the spherical phantom in the MATROSHKA-R space experiment. The experiment has been carried out onboard the ISS from 2004 to the present. The absorbed dose was determined in 32 points on the phantom's surface. We find a good agreement between the data obtained in the experiment and our calculation results. The simulation method is thus applicable for future radiation dose predictions for low-Earth orbit missions and experiments.



中文翻译:

ISS上MATROSHKA-R实验的球形体模表面上的辐射剂量分布的射线追踪模拟。

空间辐射是人类太空飞行的主要问题之一。对于实际的航天器几何形状,辐射剂量的预测对于长期任务的计划非常重要。我们提出了一种数值方法,用于快速计算太空飞行中的辐射剂量率。我们展示了其在MATROSHKA-R空间实验的第一和第二届会议上使用球形组织等效体模的剂量计算应用。该方法的主要优点是仿真时间短,因此可用于低地球轨道太空任务的紧急辐射剂量计算。

该方法使用深度剂量曲线和屏蔽与成分分布函数来计算感兴趣点的辐射剂量。使用射线追踪方法将航天器的几何形状处理为屏蔽和成分分布函数。使用GEANT4蒙特卡洛代码(版本10.00.P02)计算双层铝水屏蔽层的深度剂量曲线。铝-水屏蔽层是真实几何形状的良好近似,因为水是生物组织的良好等效物,铝是航天器主体的主要材料。

该方法用于在MATROSHKA-R空间实验中模拟球形体模表面上的剂量分布。从2004年至今,该实验已在ISS上进行。在体模表面的32个点确定吸收剂量。我们在实验中获得的数据与我们的计算结果之间找到了很好的一致性。因此,该模拟方法可用于未来的低地球轨道飞行任务和实验的辐射剂量预测。

更新日期:2019-04-03
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