
Accession Number : AD0658327
Title : SENSITIVITY ANALYSIS OF THE RADIAL DISTRIBUTION MODEL. SENSITIVITY TO CARRIER MATERIAL, YIELD AND TYPE OF FISSION,
Corporate Author : NAVAL RADIOLOGICAL DEFENSE LAB SAN FRANCISCO CALIF
Personal Author(s) : Cassidy,Samuel H. ; Crocker,Glenn R.
Report Date : 22 MAY 1967
Pagination or Media Count : 85
Abstract : A method was previously developed for calculating the distribution of fissionproduct nuclides among fallout particles as a function of size. Calculations from this Particle Activity Module of radionuclide fractionation in landsurface nuclear bursts were tested for sensitivity to three kinds of input parameter variation: (1) variation in weapon yield, (2) variation in type of fission and (3) difference in solidification temperature of the carrier material (silicate soil or coral). During the calculations a fourth input parameter, particlesize distribution, was unchanged. The calculations show the model to be relatively insensitive to variation in weapon yield and type of fission. The calculations at a solidification temperature appropriate to coral (2887K) indicated that particles smaller than 47 microns in diameter contribute about 70% of the total exposure rate, while the calculations at the silicate soil solidification temperature (1673K) indicate about 60%. The proportions of the 1hr exposurerate contributed by volatile, mixed, and refractory fissionproduct chains are considerably different for the two solidification temperatures. The temperature sensitivity of the model should be investigated in more detail, since there is reason to believe that changes in fractionation behavior which are not apparent at 1 hour after burst might be important at later times. (Author)
Descriptors : (*FALLOUT, COMPUTER PROGRAMS), (*FISSION PRODUCTS, DISTRIBUTION), SURFACE BURST, SUBSTRATES, PARTICLE SIZE, MATHEMATICAL MODELS, SENSITIVITY, FISSION, DOSE RATE, SUBROUTINES, FISSION PRODUCT ACTIVITY
Subject Categories : Radioactiv, Radioactive Wastes & Fission Prod
Distribution Statement : APPROVED FOR PUBLIC RELEASE