Accession Number : AD0617179

Title :   DISTRIBUTION AND INTENSITY OF FALLOUT FROM THE UNDERGROUND SHOT,

Corporate Author : NAVAL RADIOLOGICAL DEFENSE LAB SAN FRANCISCO CALIF

Personal Author(s) : Stetson,R. L. ; Shirasawa,T. H. ; Sandomire,M. M. ; Baum,S. ; Chan,H. K.

Report Date : 14 MAR 1958

Pagination or Media Count : 92

Abstract : One phase of the overall fallout studies on underground detonations was to make total fallout collections defining the magnitude and extent of the entire fallout event in terms of quantity of material dispersed and deposited. Such information was required to supplement and extend data from previous surface and sub-surface tests, both nuclear and high explosive, and to test and improve prediction methods developed from these data. It is estimated that 9.16 x 1,000,000 pounds of soil, which comprises 3.6 percent of the total crater material, and 2.9 x 10 to the 22nd power fissions, which comprises 17 percent of the fission yield for the Shot were deposited in the sampled area. Adequate data were obtained to show the variation in mass and radioactivity with distance in all directions from surface zero. Graphs of different types depicting these variations are presented; field gamma-flux values obtained by the project are included for comparison. Estimates of variance were determined separately for the mass and gamma activity data. A common value of = 30 percent obtained for the standard deviations was attributed to the sampling procedure, which was identical for the two sets of data.

Descriptors :   (*FALLOUT, UNDERGROUND EXPLOSIONS), (*UNDERGROUND EXPLOSIONS, FALLOUT), (*NUCLEAR EXPLOSIONS, FALLOUT), DISTRIBUTION, INTENSITY, GAMMA RAYS, RADIATION MEASURING INSTRUMENTS, HEALTH PHYSICS, NUCLEAR EXPLOSION DAMAGE, FISSION PRODUCTS

Distribution Statement : APPROVED FOR PUBLIC RELEASE