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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M. D. Bondarkov¹, V. О. Zheltonozhsky², D. E. Myznikov², A. M. Savrasov^2,*, V. I. Slisenko², M. V. Strilchuk<sup>2

1</sup> State Scientific and Research Institution “Chornobyl Centre for Nuclear Safety, Radioactive Waste, and Radioecology”, Slavutych, Ukraine
² Institute for Nuclear Research, National Academy of Sciences of Ukraine, Kyiv, Ukraine

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

Abstract: A spectroscopic method has been developed based on measuring of beta-spectra, which takes into account the physico-chemical state of the investigated objects and the instability of electronic systems in field conditions. This method allows for the investigation of the ⁹⁰Sr and ¹³⁷Cs concentration in various objects with a change in the ¹³⁷Cs/⁹⁰Sr ratio from 1 to 100 with an error of better than 20 %. A methodology has been developed that takes into account the change in the density of the inanimate objects and is based on shifting of the peak position of the conversion electrons from the ¹³⁷Cs decay. The verification of the methodology compared to radiochemical measurements of ⁹⁰Sr in soil samples showed complete agreement within 10 - 15 %, with a change of the activity in the samples by four orders of magnitude.

Keywords: beta-spectrometry, methods of ⁹⁰Sr registration, ⁴⁰K, ⁹⁰Sr, and ¹³⁷Cs calibration sources, radiochemical methods.

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