1968•OSTI OAI (U.S. Department of Energy Office of Scientific and Technical Information)Requires access
GAMMA-RAY FIELDS ABOVE ROUGH CONTAMINATED SURFACES.
Charles B. Bennett, Willard S. Kehrer, Richard R. Soule, James P. Corn
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Abstract
Abstract : An experiment was performed to determine the effect of surface roughness on the gamma radiation exposure rate above fallout-contaminated surfaces. Gamma radiation measurements were made at heights of 1, 4, 8, and 16 meters and at horizontal distances of 0 to 128 meters from the center of a 10 ft diameter circle of Au198 contamination on various surfaces, from plate glass to 5/8 in. gravel. Two supplemental tests were conducted with Lu177 contamination on plate glass and 5/8 in. gravel in an attempt to establish the energy dependence of the roughness effect. The measured values were numerically integrated to approximate the gamma exposure field above a uniformly contaminated infinite plane of the base material. For each surface material, the intensity of the gamma exposure field (in Roentgens per hour for a contamination density of 1 curie per square meter, r/hr per Ci/sq m was divided by the gamma intensity over a contaminated plate glass surface to obtain a surface roughness ratio for each of 4 heights. The 1-meter values are presented. (Author)