Publication: Estimation of Accuracy of the Method of Gamma- Spectrometry for Non-Destructive Control of Gadolinium Content and Uranium Enrichment in Non-Irradiated VVER-type Fuel Pellets
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2020
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Stogov, Yu. V.
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© Published under licence by IOP Publishing Ltd.The gamma-spectra of the single (UO2-Gd2O3)-pellets were measured on the planar detector HPLeGe. The measurements of Gd content in (UO2-Gd2O3)-pellets were performed by X-ray fluorescence method. The total count rate in the doublet 42,3 and 43,0 keV Ka1,2-X-rays from Gd was used as a measure of Gd content. In measurements was used241Am as an external radiation source for exciting the doublet 42,3 and 43,0 keV Ka1,2-X-rays from Gd. In order to obtain the calibration dependence of count rate in doublet 42,3 and 43,0 keV from Gd content in (UO2-Gd2O3)-pellets there were used standard (UO2-Gd2O3)-pellets with the known Gd content, density and enrichment. The estimates of influence of deviations of the density of (UO2-Gd2O3)-pellets and Gd content on total count rate in doublet 42,3 and 43,0 keV were performed. The "pure"gamma-spectra (without employing of external radiation source) were used to obtain the data on uranium enrichment of fuel pellets using multigroup gamma-spectra analysis code (MGAU) and additional information about Gd content. The dependence of S185,7keV/S98,43keV from Gd content in (UO2-Gd2O3)-pellets is present (the ratio of count rates for two peaks: E?=185,7 keV (the measure of235U) and E=98,43 keV (the measure of235,238U).
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Stogov, Yu. V. Estimation of Accuracy of the Method of Gamma- Spectrometry for Non-Destructive Control of Gadolinium Content and Uranium Enrichment in Non-Irradiated VVER-type Fuel Pellets / Stogov, Yu.V. // Journal of Physics: Conference Series. - 2020. - 1689. - № 1. - 10.1088/1742-6596/1689/1/012060