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Articles 211 - 211 of 211
Full-Text Articles in Nuclear Engineering
The Self-Shielding Of Fallout Gamma Rays By Terrain Roughness, Mark S. Herte
The Self-Shielding Of Fallout Gamma Rays By Terrain Roughness, Mark S. Herte
Theses and Dissertations
The study presents a first order calculation of the self-shielding of nuclear weapon fission fragment gamma rays by surface roughness (microscopic terrain irregularities). To simulate fallout particles, polymer microspheres were deposited on slides containing samples of soil, concrete and asphalt roofing shingles. Scanning electron microscopy was used to photographically map the surfaces. The thickness of surface irregularities at various angles was measured by converting the photographs to digital images. Measurements showed a dependence upon the surface type, but not upon particle size. Average values of the measurements were modelled using a homogeneous buried source. With this geometry, dose rates were …