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Registration Number

0225U001434, (0124U000530) , R & D reports

Title

Determination of transformation processes of uranium compounds in lava-like fuel-containing materials of the Chernobyl NPP

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Виготовлення нестабільних сполук урану. Розробка методики вимірювань на спектрометрі СПРУТ СЕФ-0,1.

Head

Mykhailov Ihor F., Доктор фізико-математичних наук

Registration Date

31-01-2025

Organization

National Technical University "Kharkiv Polytechnic Institute"

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The goal of the project is to determine the decomposition of uranium compounds with light elements, which arose within 37 years after the accident at the Chernobyl nuclear power plant; development of recommendations for stopping the degradation of Chernobyl lava, which preserves radioactively dangerous products of the accident.

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 An X-ray optical scheme for measuring the ratio of Compton and Rayleigh scattering peaks for heavy metals on the SPRUT X-ray spectrometer has been developed; experimental measurements have been carried out for the closest analogues of uranium (Z=92), namely the heavy metals lead (Z=82) and bismuth (Z=83) and their oxides. Complex secondary emitters Ag-Nb, Ag-Ge and Nb-Ge were designed and manufactured for the analysis of materials with effective atomic number Z from 21.6 (U2O3) to 92 (U) and the calibration of the spectrometer in the range of effective atomic numbers from 22 (Ti) to 83 (Bi), which allowed calculating the sensitivity of determining the atomic number of a mixture of substances. Preliminary measurements have been made on compounds of tungsten, lead, and bismuth, which are close in effective atomic number to mixtures of uranium oxides. The sensitivity of the ratio of scattering peaks to phase transformations during the thermal oxidation of heavy metals and uranium has been experimentally determined; the estimated sensitivity of the ratio of scattering peaks during the interaction of uranium with oxygen is about 1 wt % of oxygen in combination with uranium, which provides the possibility of calibrating the process of uranium saturation with light elements – oxygen, nitrogen, carbon – by the ratio of scattering peaks.

Product Description

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Borysova Svitlana S.
Kniaziev Serhii A.
Kushtym Anton V.
Mykhailov Anton I.

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2025-01-31