Space radiation shielding calculation models for LEO satellites

Two approximate calculation models for a cosmic radiation shielding in LEO satellites were proposed. They are a sectoring method and a chord-length distribution method. In order to simulate cosmic radiation environments, IGRF model and AP(E)-8 model were used. When an approximate method was applied in this study, complex structure of satellite was described into multiple 1-dimensional slabs, and the pre-calculated dose-depth conversion function was introduced to simplify the calculation process. Verification calculation was performed for orbit location and structure geometry of KITSAT-1 and compared with detailed 3-dimensional calculation results and experimental values. The calculation results from approximate method were estimated conservatively with acceptable error. However, results for satellite mission simulation were underestimated in total dose rate compared with experimental values.