Numerical model for computation of effective and ambient dose equivalent at flight altitudes - Application for dose assessment during GLEs
Numerical model for computation of effective and ambient dose equivalent at flight altitudes - Application for dose assessment during GLEs
复制标题
用于计算飞行高度有效剂量当量和环境剂量当量的数值模型 - GLE 期间剂量评估的应用
DOI：
10.1051/swsc/2015011
复制
发表时间：
2015
影响因子：
3.3
通讯作者：
I. Usoskin
中科院分区：
文献类型：
--
作者：
A. Mishev;I. Usoskin
本文提出了一个用于估算商业飞机高度银河系和太阳起源的次级宇宙线粒子产生的有效剂量和环境剂量当量的数值模型。该模型代表了一种基于宇宙射线地面测量的全链分析，从粒子光谱和角度特征到剂量估计。该模型基于最新的数值计算的产额函数和宇宙线在地球磁层中的真实传播。利用直接的完全蒙特卡罗模拟计算了初级质子和α粒子引起的大气级联，以及随后次级粒子通量(中子、质子、伽马、电子、正电子、介子和带电介子)到有效剂量或环境剂量当量的转换。将环境剂量当量与不同条件下的参考数据进行比较，如刚性、截止值和太阳活动水平。将该方法应用于2006年12月13日地面增强期间飞行高度有效剂量率的计算。太阳质子谱是利用中子监测数据得出的。事件期间有效剂量率的计算明确考虑了导出的各向异性，即俯仰角分布以及太阳质子在地球磁层中的传播。
A numerical model for assessment of the effective dose and ambient dose equivalent produced by secondary cosmic ray particles of galactic and solar origin at commercial aircraft altitudes is presented. The model represents a full chain analysis based on ground-based measurements of cosmic rays, from particle spectral and angular characteristics to dose estimation. The model is based on newly numerically computed yield functions and realistic propagation of cosmic ray in the Earth magnetosphere. The yield functions are computed using a straightforward full Monte Carlo simulation of the atmospheric cascade induced by primary protons and α -particles and subsequent conversion of secondary particle fluence (neutrons, protons, gammas, electrons, positrons, muons and charged pions) to effective dose or the ambient dose equivalent. The ambient dose equivalent is compared with reference data at various conditions such as rigidity cut-off and level of solar activity. The method is applied for computation of the effective dose rate at flight altitude during the ground level enhancement of 13 December 2006. The solar proton spectra are derived using neutron monitor data. The computation of the effective dose rate during the event explicitly considers the derived anisotropy i.e. the pitch angle distribution as well as the propagation of the solar protons in the magnetosphere of the Earth.