Environmental Characteristics and patterns of High-Intensity Plused Gamma Radiation in High-Altitude Regions

[Background] Strong radiation fields generated by high-altitude gamma-ray transmission through the upper atmosphere can cause performance degradation or functional failure in onboard electronic systems of orbiting satellites. [Purpose] This study aims to investigate the characteristics of intense radiation fields generated by the propagation of strong pulsed gamma rays in the upper atmosphere. [Methods] Monte Carlo methods coupled with variance reduction techniques were employed to achieve high-precision simulations of long-range pulsed gamma-ray transport. The spatial distributions of peak gamma dose rates (Si) and total gamma doses (Si) across varying source altitudes were quantified. Based on an analysis of the dosimetric characteristics and the behavior of pulsed gamma radiation fields, the concept of mass thickness was applied to describe the combined attenuation mechanisms (absorption and scattering) of the atmosphere on gamma-ray propagation. [Results] A universal computational formula was derived to calculate the spatial distributions of gamma dose metrics under diverse source conditions. This formula demonstrated a discrepancy of less than 10% when compared with detailed numerical simulation results. [Conclusions] The proposed framework offers an accuracy- and efficiency-optimized computational approach for the design of spacecraft radiation protection in high-altitude pulsed gamma radiation environments.