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Photon and Electron Shielding for Neptunium-237

Electron and photon shallow-dose-equivalent (SDE) rates were calculated on the exterior surface of bare and shielded Np-237 spheres. Electron SDE greatly exceeds photon SDE for bare and high atomic-number (Z) shielded spheres. An outer low-Z shield is necessary to minimize SDE from electrons induced by photons in outer edge of Np-237 or inner high-Z shield. Implications of electron SDE on shielding design were considered. Upper limits on electron SDE were calculated.