Rapid Microdetermination of Indium by Neutron Activation


IT is known that 2.5-sec indium-116mm (ref. l) is formed by neutron irradiation of natural indium and that it emits 0.15-MeV γ-ray. The size of the photopeak due to this γ-ray, obtained immediately after irradiation, can be estimated by the use of the data presented in a γ-ray spectra catalogue2. The peak size per 1 µg of indium is as large as that of silver when they are irradiated respectively for a period equal to the half-life of the nuclide formed, that is, 2.5 sec for indium and 24 sec for silver. Since silver is the most sensitive3,4 in γ-ray counting after neutron irradiation, it is deduced that indium is also very sensitive.


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OKADA, M., KAMEMOTO, Y. Rapid Microdetermination of Indium by Neutron Activation. Nature 197, 279 (1963). https://doi.org/10.1038/197279a0

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