Ядерна фізика та енергетика Nuclear Physics and Atomic Energy   ISSN: 1818-331X (Print), 2074-0565 (Online)   Publisher: Institute for Nuclear Research of the National Academy of Sciences of Ukraine   Languages: Ukrainian, English   Periodicity: 4 times per year   Open access peer reviewed journal

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V. О. Zheltonozhskyi, D. E. Myznikov, A. M. Savrasov^*, V. I. Slisenko

Institute for Nuclear Research, National Academy of Sciences of Ukraine, Kyiv, Ukraine

^*Corresponding author. E-mail address: asavrasov@kinr.kiev.ua

Abstract: The γ-spectra were measured of the structural materials of the 2nd unit of the Chornobyl NPP which were irradiated by bremsstrahlung with end-point energy 37 MeV. Using the ratio of the ⁵⁷Co and ⁵⁸Co activities, the nickel and cobalt masses ratio was determined. Using the obtained data and the measured ⁶⁰Co activity in the studied samples, a method for determining of the ⁶³Ni activity was developed. Radiochemical validation of the created method was performed and good quantitative agreement of ⁶³Ni activities obtained by spectroscopic and radiochemical methods was obtained.

Keywords: flux-weighted average yields, photoactivation method, γ-spectrometry, nickel, cobalt.

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