Accession Number:

AD0694731

Title:

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

Descriptive Note:

Corporate Author:

DEFENCE CHEMICAL BIOLOGICAL AND RADIATION LABS OTTAWA (ONTARIO)

Personal Author(s):

• Clifford,C. E.

Report Date:

1964-07-29

Pagination or Media Count:

12.0

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
• Radioactivity, Radioactive Wastes and Fission Products

Distribution Statement:

APPROVED FOR PUBLIC RELEASE