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

被引：29
作者：
Rautiyal, P. [1 ]
Gupta, G. [1 ]
Edge, R. [2 ]
Leay, L. [2 ,3 ]
Daubney, A. [2 ]
Patel, M. K. [4 ]
Jones, A. H. [1 ]
Bingham, P. A. [1 ]
机构：
[1] Sheffield Hallam Univ, Mat & Engn Res Inst, City Campus,Howard St, Sheffield S1 1WB, S Yorkshire, England
[2] Univ Manchester, Dalton Cumbrian Facil, Westlakes Sci & Technol Pk, Moor Row CA24 3HA, Cumbria, England
[3] Univ Manchester, Sch Mech Aerosp & Civil Engn, Oxford Rd, Manchester M19 9PL, Lancs, England
[4] Univ Liverpool, Dept Mech Mat & Aerosp, Harrison Hughes Bldg,Brownlow Hill, Liverpool L69 3GH, Merseyside, England
来源：
JOURNAL OF NUCLEAR MATERIALS | 2021年 / 544卷
基金：
英国工程与自然科学研究理事会;
关键词：
ELECTRON-SPIN-RESONANCE; RADIATION-DAMAGE; STRUCTURAL DEFECTS; OPTICAL-PROPERTIES; BETA-IRRADIATION; SILICATE-GLASSES; OXIDE GLASSES; HIGH-PURITY; NUCLEAR; SODIUM;
D O I：
10.1016/j.jnucmat.2020.152702
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
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 and the possible formation of metal colloids upon irradiation have been discussed. (C) 2020 Elsevier B.V. All rights reserved.
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页数：11
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