_ spun Project 2.52 - Neutron Induced Soil Radioactivity ~ T. C. Looney OBJECTIVE To determine experimentally the radioactivity in various typical soi] samples induced by irradiation in a thermonuclear detonation. Interpretation of the data will have as its objective the prediction of soil radioactivity for a nuclear explosion at any location. EXPERIMENTAL PROCEDURE Samples used were representative of several soils from the continental U.S., including Nevada Test Site soil, and from Puerto Rico, Hawaii, and Bikini Atoll, The exposure containers were lengths of steel pipe placed at various ranges from planned ground zero. “ff Inter- pretation was to be by means of gamma-ray spectroscopy, for induced gamma intensity vs energy and time, and by chemical analysis. RESULTS Extended ranges to actual ground zero precluded the activation of any of the samples, COPIED/p | LANL Re Of wo 3