Accession Number : AD0670480

Title :   ANGULAR RADIATION CHARACTERISTICS OF ROUGH SURFACES CONTAMINATED WITH FALLOUT SIMULANT,

Corporate Author : NAVAL RADIOLOGICAL DEFENSE LAB SAN FRANCISCO CALIF

Personal Author(s) : Shumway,Bruce W. ; Frank,Allen L.

Report Date : 29 FEB 1968

Pagination or Media Count : 50

Abstract : The unscattered radiation from rough surfaces was measured using a NaI (T) spectrometer. The surfaces were prepared from rocks of graded size and for different spacings between the rocks. Some surfaces were dry and some sticky. Both perpendicular incidence of the contaminant upon the surface and oblique incidence were studied. The effects of thin aluminum sheets overlying activity on a flat smooth surface were also studied. In all cases the reduction in intensity of the primary radiation was measured as a function of angle relative to the normal to the surface. Whether or not a surface was sticky and, if sticky, the angle of incidence of the contaminant upon the surface affected the angular intensity of the radiation markedly. For one sticky surface the activity deposition was studied in detail. The findings together with the angular intensity measurements suggested a new mathematical model to represent sticky surfaces. (Author)

Descriptors :   (*FALLOUT, MEASUREMENT), (*RADIOACTIVE CONTAMINATION, SURFACES), ROCK, PARTICLE SIZE, ROUGHNESS, INTENSITY, ALUMINUM, SHEETS, DEPOSITION, MATHEMATICAL MODELS, NUCLEAR RADIATION, SIMULATION, SODIUM COMPOUNDS, IODIDES, SPECTROMETERS

Subject Categories : Radioactiv, Radioactive Wastes & Fission Prod

Distribution Statement : APPROVED FOR PUBLIC RELEASE