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EFFECTS OF THE GROUND ON THE GAMMA DOSE FROM DISTRIBUTED 137Cs SOURCES,
DEFENCE CHEMICAL BIOLOGICAL AND RADIATION LABS OTTAWA (ONTARIO)
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The effects on the exposure dose of different ground materials and of a ground cover similar to snow were measured for a smooth surface contaminated with 0.66-MeV gamma sources 137Cs. Measurements were made also of the effect of a rough surface on the exposure dose. For uniform contamination of a smooth ground, agreement within 10 was obtained with theoretical dose distributions based on infinite-medium calculations. However, even moderate ground roughness reduced the dose at a detector height of 1 meter by a factor of two below its value for a smooth surface. Failure to specify the effect of ground roughness on smooth field calculations as a function of the surface roughness appeared to be the largest source of error in the calculation of exposure dose. Author
APPROVED FOR PUBLIC RELEASE