SHIELDING FACTORS FOR UNDERGROUND SHELTERS OF VARIOUS GEOMETRIC SHAPES
NAVAL CIVIL ENGINEERING LAB PORT HUENEME CA
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This study investigates the additional nuclear shielding from an isotropic plane radioactive gamma source afforded by various shapes of underground curved-roof shelters compared to the basic slab shield. This additional shielding is defined in the form of a dimensionless Geometry Factor which is a function of the physical dimensions and shape of the shelter. Curves are presented from which the Geometry Factors for the underground shelter shapes of spheres, horizontal cylinders, ellipsoids, and vertical cylinders or silos can be obtained with minimum calculations using only the physical dimensions of the shelter and the depth of material above the crown of the shelter. The Geometry Factors thus obtained are independent of material and photon energy except in the case of the silo and can be used as dimensionless factors once the attenuation for a slab shield has been calculated for a particular set of radiological conditions and materials.
- Civil Defense
- Nuclear Radiation Shielding, Protection and Safety