Abstract—
A photoactivation method has been developed for determining the activity of long-lived nickel isotopes by the 60Co activity in metallic structural materials of a reactor core. The error of this method is 5–10%, and the sensitivity is 0.5 Bq/g if semiconductor γ-ray spectrometers with high-purity germanium detectors are used. Following the proposed approach, it is possible to significantly simplify the identification, testing, and certification of metallic structural materials at the stage of reactor decommissioning as well as to significantly reduce the cost of these works compared to the radiochemical methods.
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ACKNOWLEDGMENTS
We thank I.E. Vlasova, Senior Researcher at the Radiochemistry Department of Moscow State University, for her help in analyzing the elemental composition of the samples.
Funding
This study was supported by the Russian Science Foundation (project no. 22-29-01013).
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Translated by N. Goryacheva
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Zheltonozhskaya, M.V., Chernyaev, A.P., Yusyuk, D.A. et al. Photoactivation Approach to the Determination of Long-lived Nickel Isotopes in NPP Structural Materials. Instrum Exp Tech 66, 285–292 (2023). https://doi.org/10.1134/S0020441223010281
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DOI: https://doi.org/10.1134/S0020441223010281