Space agencies are currently developing reference mission scenarios to determine if occupational dose limits, already adopted for low-Earth orbit (LEO) missions to the International Space Station (ISS), are also applicable for deep space cis-lunar missions. These cis-lunar missions can potentially last upwards of a year, during which astronauts will experience a daily low-dose from galactic cosmic radiation (GCR) and a potentially high-dose from single, or multiple, solar particle events (SPEs). Unlike GCR exposure, SPEs are difficult to predict and model due to their sporadic nature. Consequently, mission planners have decided to rely on historical SPE spectra to prepare for the ‘worst case’ scenario. Assuming a spherical aluminum shell as a reference spacecraft, this paper demonstrates how the choice of SPE parametric model, shield thickness, dose metric, and radiation transport code can impact the decision-making criteria for the worst case SPE, the estimated GCR dose, and consequently whether current LEO dose limits are applicable.

航天机构目前正在制定参考任务方案，以确定向国际空间站（ISS）的低地球轨道（LEO）任务已经采用的职业剂量限值是否也适用于深空顺月任务。这些顺月任务可能会持续一年以上，在此期间，宇航员将每天从银河宇宙辐射（GCR）经历低剂量，而从一次或多次太阳粒子事件（SPE）经历高剂量。与GCR暴露不同，SPE由于具有零星的性质而难以预测和建模。因此，任务计划者已决定依靠历史SPE频谱为“最坏情况”场景做准备。假设以球形铝壳为参考航天器，本文将说明SPE参数模型，屏蔽层厚度，