Accession Number:

AD0668327

Title:

GAMMA RAY FIELDS ABOVE ROUGH CONTAMINATED SURFACES,

Descriptive Note:

Corporate Author:

NAVAL RADIOLOGICAL DEFENSE LAB SAN FRANCISCO CALIF

Report Date:

1968-05-06

Pagination or Media Count:

211.0

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 58 in. gravel. Two supplemental tests were conducted with Lu177 contamination on plate glass and 58 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, rhr per Cisq 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

Subject Categories:

  • Radioactivity, Radioactive Wastes and Fission Products
  • Nuclear Physics and Elementary Particle Physics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE