Gamma irradiation-induced defects in borosilicate glasses for high-level radioactive waste immobilisation

RAUTIYAL, Prince, GUPTA, Gaurav, EDGE, Ruth, LEAY, Laura, DAUBNEY, Aaron, PATEL, Maulik, JONES, Alan and BINGHAM, Paul (2020). Gamma irradiation-induced defects in borosilicate glasses for high-level radioactive waste immobilisation. Journal of Nuclear Materials.

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Official URL: https://www.sciencedirect.com/science/article/pii/...
Link to published version:: https://doi.org/10.1016/j.jnucmat.2020.152702
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    Abstract

    Gamma irradiation-induced defects at doses of 0.5 and 5 MGy were studied in lithium sodium-borosilicate (LiNaBSi) and sodium barium-borosilicate (NaBaBSi) glasses, used for high-level radioactive waste immobilisation in the UK and India, respectively. X-band electron paramagnetic resonance (EPR), Raman and UV-Vis-nIR spectroscopies were used to characterise the glasses before and after irradiation. EPR and UV-Vis-nIR absorption spectroscopies revealed the formation of boron-oxygen hole centres (BOHC), electrons trapped at alkali cations or ET centres and peroxy-radicals (PORs) as defects common to both glasses. In addition, E− or polaron centres were observed in NaBaBSi glasses, possibly related to formation of elemental sodium colloids. Time-dependent thermal annealing at a range of temperatures, including those relevant to canister centreline cooling (CCC), which may be of relevance to geological disposal in future technical assessments, was carried out to study thermal stability of these radiation-induced defects. It was observed that PORs are the most thermally-stable defects in both glasses. The influence of glass composition on the segregation of sodium; possible formation of metal colloids upon irradiation has been discussed.

    Item Type: Article
    Uncontrolled Keywords: 0912 Materials Engineering; Energy
    Identification Number: https://doi.org/10.1016/j.jnucmat.2020.152702
    SWORD Depositor: Symplectic Elements
    Depositing User: Symplectic Elements
    Date Deposited: 26 Nov 2020 17:16
    Last Modified: 06 Jan 2021 16:33
    URI: http://shura.shu.ac.uk/id/eprint/27681

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