Accession Number:

AD0658878

Title:

MODELS OF GROUND ROUGHNESS IN A FALLOUT FIELD,

Descriptive Note:

Corporate Author:

NAVAL RADIOLOGICAL DEFENSE LAB SAN FRANCISCO CALIF

Personal Author(s):

Report Date:

1967-09-26

Pagination or Media Count:

64.0

Abstract:

Gamma radiation from fallout particles deposited on rough ground is attenuated compared to that from particles on a smooth plane. In this report six models of ground roughness are considered. Ground roughness factors are found for each of the models, allowing one to correct from the calculated exposure rate due to unscattered radiation for a smooth field, provided the parameters of the model can be component are found in some cases. Experimental angular roughness factors are compared with those of the models. It is found that one model, the uniform volume source model, fits all the data well, and that the uniform absorbing layer model also fits the data satisfactorily. The more exotic models give angular roughness functions which have the wrong properties to fit the observed data. Author

Subject Categories:

  • Radioactivity, Radioactive Wastes and Fission Products

Distribution Statement:

APPROVED FOR PUBLIC RELEASE