太阳系边际探测任务辐射效应综合分析

Comprehensive Radiation Effects Analysis of Exploration to the Boundary of the Solar System

针对太阳系边际探测任务中面临的强辐射问题,在太阳系边际鼻尖和尾部两次探测任务中,系统分析了探测器飞行过程中涉及到的空间辐射环境,包括地球辐射环境、太阳宇宙线辐射环境、银河宇宙线辐射环境、木星辐射环境和海王星辐射环境及模型特点。采用模型仿真给出了屏蔽厚度与辐射剂量关系曲线,结合国外探测数据获得了两次任务遭受的辐射总剂量,估算结果可支持在屏蔽重量代价和探测器抗辐射能力之间进行优化选择。针对空间核电源辐射特性,提出了适用于工程应用的核电源辐射效应分析方法。结合探测任务特点和工程可实现性,对各类辐射效应的综合影响提出了系统级防护策略,为太阳系边际探测的方案设计和任务实施提供了技术支持和参考。

In view of the strong radiation problem in the exploration missions to the boundary of the Solar System,the space radiation environment involved in the flight of the probe is systematically analyzed,including the earth radiation environment,solar cosmic ray radiation environment,galactic cosmic ray radiation environment,Jupiter radiation environment and Neptune radiation environment and the characteristics of the model.The relationship curve between shielding thickness and radiation dose is given by model simulation.Combined with foreign detection data,the total radiation dose suffered by the two missions is obtained.The estimated results can support the optimization choice between shielding weight cost and anti-radiation capability of the probe.According to the radiation characteristics of space nuclear power,a method of radiation effect analysis of nuclear power suitable engineering applications are proposed.Combined with the characteristics of the exploration mission and the engineering reliability,the system level protection strategy against the various radiation effects is proposed,which provides technical support and reference for the scheme design and mission implementation of exploration to the boundary of the Solar System.