Accession Number : AD0694731

Title :   EFFECTS OF THE GROUND ON THE GAMMA DOSE FROM DISTRIBUTED 137Cs SOURCES,

Corporate Author : DEFENCE CHEMICAL BIOLOGICAL AND RADIATION LABS OTTAWA (ONTARIO)

Personal Author(s) : Clifford,C. E.

Report Date : 29 JUL 1964

Pagination or Media Count : 12

Abstract : 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)

Descriptors :   (*FALLOUT, DOSE RATE), GAMMA RAYS, TERRAIN, CONTAMINATION, PROTECTION, SURFACE PROPERTIES, SURFACE ROUGHNESS, TRACER STUDIES, SNOW, CESIUM, CIVIL DEFENSE, CANADA

Subject Categories : Civil Defense
      Radioactiv, Radioactive Wastes & Fission Prod

Distribution Statement : APPROVED FOR PUBLIC RELEASE