Accession Number : AD0678727

Title :   GAMMA EXPOSURE RATES FROM A VARIETY OF AMBIENT OR NONAMBIENT CYLINDRICAL FISSION - PRODUCT SOURCES: A MODEL FOR THEIR CALCULATION.

Descriptive Note : Technical rept.,

Corporate Author : NAVAL RADIOLOGICAL DEFENSE LAB SAN FRANCISCO CALIF

Personal Author(s) : Young,Frank H.

Report Date : 07 JUN 1968

Pagination or Media Count : 40

Abstract : A mathematical model is developed for the calculation of free-field gamma exposure rates from a variety of U235-mixed-fission-product sources. The source geometries considered include ambient or non-ambient cylindrical or annular sources, and an ambient cylindrical source encased in a non-ambient topped annulus. In the integration procedures, the self-attenuation of the sources is considered and time-dependent effective attenuation coefficients are employed to characterize the attenuation and absorption of the spectra of gamma photons emitted from the fission product radionuclides. The model is formulated in a manner suitable for numerical evaluation. (Author)

Descriptors :   (*UNDERWATER EXPLOSIONS, FISSION PRODUCTS), (*GAMMA EMISSION, MATHEMATICAL MODELS), CYLINDRICAL BODIES, DOSE RATE, SOURCES, RADIOACTIVE ISOTOPES, NUMERICAL ANALYSIS, COMPUTER PROGRAMMING

Subject Categories : Radioactiv, Radioactive Wastes & Fission Prod

Distribution Statement : APPROVED FOR PUBLIC RELEASE