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Chemical alteration of 238Pu-loaded borosilicate glass under saturated leaching conditions

Bella Yu. Zubekhina , Andrei A. Shiryaev , Boris E. Burakov , Irina E. Vlasova , Alexey A. Averin , Vasily O. Yapaskurt and Vladimir G. Petrov EMAIL logo
From the journal Radiochimica Acta

Abstract

Highly radioactive 238Pu-doped and non-radioactive samples of borosilicate glass with chemical compositions and synthesis routine similar to SON68 glass were studied under static saturated leaching conditions in distilled water at 90 °C. Dramatic differences in behavior of the radioactive and model glasses were observed. On time scale of 4 months the radioactive glass is fully covered by mechanically unstable alteration layer, possibly consisting of aluminum hydroxides with small fraction of a separate secondary Pu bearing phase. The model glass remains virtually pristine. Addition of Eu3+ into the glass allowed examination of the glass radio- and photoluminescence and to assess changes or REE3+ impurity local environment during self-irradiation and leaching. Photoluminescence spectra suggest more ordered local environment of europium ions in the alteration “gel” than in the bulk glass. Peculiar behavior of the photoluminescence spectra excited at different laser power is observed for the alteration layer and is ascribed to optical bleaching of color centers.

Funding source: RFBR

Award Identifier / Grant number: #17-303-50018

Award Identifier / Grant number: 18-29-12032

Funding statement: We thank anonymous reviewer for useful comments. This study was partly supported by RFBR grants #17-303-50018 and 18-29-12032. Part of the measurements were performed using equipment of CKP FMI IPCE RAS.

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Received: 2018-12-18
Accepted: 2019-04-18
Published Online: 2019-06-01
Published in Print: 2019-12-18

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