Abstract
The changes in the gamma spectra of soils neutron-irradiated in UCLA Engineering Reactor were followed up to 8883 hr. Although the soils studied differed widely in their physical and chemical characteristics from an agronomic point of view, their gamma spectra were quite similar, indicating similar chemical composition with respect to activation analysis. In general, with the progressive decay of various radioisotopes the gamma spectra of the several soils passed through a number of rather clearly defined conformations associated with a relatively few radioisotopes which prevail at a given time. These conformations were attributable to a sequence of certain dominant radioisotopes during the study period as follows: 56Mn, 56Mn/24Na, 24Na, 24Na/140La/46Sc/59Fe, 46Sc/59Fe/60Co, 46Sc/60Co/134Cs and 60Co/134Cs/152Eu. The radionuclides, identified within the limits of this work, were 56Mn, 24Na, 140La, 46Sc, 59Fe, 60Co, 134Cs, 152/154Eu, 86Rb, 131Ba and 42K.
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