Accession Number : AD0430301

Title :   MASS DISTRIBUTION MEASUREMENTS OF CRATER EJECTA AND DUST,

Corporate Author : ARMY ENGINEER WATERWAYS EXPERIMENT STATION VICKSBURG MS

Personal Author(s) : Rooke, A. D., Jr. ; Davis, L. K.

Report Date : JUL 1963

Pagination or Media Count : 112

Abstract : An array of tarpaulins was placed in a concentric circular pattern about the ground zero of a nuclear device with an intended yield of 470 tons. The device was detonated at a depth of 33.5 meters in a basalt medium. After the shot, when the residual radioactivity permitted, samples of ejecta and dust thrown from the crater and deposited on the tarpaulins were recovered, weighed, and analyzed for particle size. The nearest samples to GZ were recovered at a radial distance of 94 meters and the most remote at 268 meters. From a total of 158 collector stations, 27 samples were recovered. Mass distribution per unit area and size distribution were tabulated and shown graphically as functions of radial distance from GZ. The amount of deposition was found to decrease sharply with distance; most of the deposition was from within 150 meters of GZ. Particle size similarly decreased with distance from GZ, the percentage of fines increasing rapidly beyond the 94-meter collector ring. Results of similar experiments are summarized and compared with Danny Boy data by means of dimensionless plots. (Author)

Descriptors :   (*UNDERGROUND EXPLOSIONS, NUCLEAR WEAPONS), PARTICLE SIZE, SOILS, COLLECTING METHODS, DISTRIBUTION, CRATERING, MEASUREMENT.

Distribution Statement : APPROVED FOR PUBLIC RELEASE