Abstract: In the space environment around Jupiter, the dominant particles are high-energy electrons with E > 1 MeV (and can be higher than 100MeV), which can cause internal dielectric charging effects in spacecraft electronics. Huge mass is required to shield these electrons to reduce the incident internal flux to a safe level. The GEANT4 and RIC (radiationinduced conductivity) Monte Carlo toolkit method was used to study an optimum single shielding material design for high energy electrons during a Jupiter mission. Al, Ti, Fe, Cu, Ta and Pb were investigated as possible materials for spacecraft shielding. Calculation results indicate that, to mitigate internal dielectric charging effects during a Jupiter mission, lowZ materials provide less-efficient shielding with the same areal mass than high-Z materials. Therefore, shielding mass can be saved by using Ti, Fe, Cu, Ta or Pb, instead of Al which is commonly used in Earth orbits.

Key words: Jupiter orbits, internal dielectric charging effects, shielding materials, charging electric field, charging potential, space radiation