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