It is shown that In 113* can be obtained by nuclear excitation of indium by X-rays. The cross-section per nucleus for the production of In 113* with 2 MeV. X-rays is of the same order as the cross-section for the production of In 115* . The decay period of In 115* , for which some discrepancy was apparent in the literature, was definitely proved to be 4·5 hr.
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Dunworth et al. (1947) studied this question.
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