Ground Roughness Effects on the Energy and Angular Distribution of Gamma Radiation from Fallout

📖 The Scoop

The importance of ground roughness as a mechanism for natural shielding from fallout radiation has long been recognized, and experimental measurements have been made of dose vs. height above a rough plane. In the theoretical treatment of ground-roughness shielding, it has been generally supposed that radioactivity could be considered as being mixed uniformly with soil throughout a surface layer of a smooth plane, the depth of the surface layer depending on the degree of ground roughness. Alternatively, a simpler model can be used where the fallout is treated as though it were buried beneath the surface of an infinite smooth plane, the depth of the hypothetical fallout layer depending on the roughness of the ground. 1-3 This simpler model is clearly to be preferred if it gives satisfactory agreement with experiment because the calculations to be performed are easier. An earlier investigation was concerned with the measurement of the angular distribution and energy distribution of fallout radiation above a nearly level desert pavement of coarse gravel that was relatively free of sagebrush. Dose-vs.-height measurements were not made as a part of that investigation.

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