FIELD: chemistry.
SUBSTANCE: method of controlling mass ratio of uranium-235 isotope in gaseous uranium hexafluoride involves desublimation of gaseous uranium hexafluoride in a measuring chamber by lowering temperature of the base of the chamber, determination of gamma-ray intensity of the uranium-235 isotope in the solid phase and calculation of the mass ratio of the uranium-235 isotope in uranium hexafluoride using the formula: C = α*Iγ/M, where: M is mass of uranium hexafluoride in the measuring chamber determined using a mass flowmeter or a weight measuring system, g; Iγ is gamma-ray intensity of uranium-235 in solid uranium hexafluoride in the measuring chamber, s-1; α is a calibration coefficient.
EFFECT: higher efficiency and accuracy of determining mass ratio of uranium-235 in gaseous uranium hexafluoride.
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