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Initial studies on the effects of radiation, thermal ageing and aqueous environments on the stability and structure of candidate polymeric encapsulant materials

Published online by Cambridge University Press:  05 July 2018

J. Dawson ,
V. Smith ,
J. Clifford  and
S. J. Williams
J. Dawson*
Affiliation:
AMEC, B150, Thomson Avenue, Harwell, Didcot, Oxfordshire OX11 0QB, UK
V. Smith
Affiliation:
AMEC, B150, Thomson Avenue, Harwell, Didcot, Oxfordshire OX11 0QB, UK
J. Clifford
Affiliation:
Sellafield Limited, Sellafield, Seascale, Cumbria CA20 1PG, UK
S. J. Williams
Affiliation:
NDA Harwell Office, B587, Curie Avenue, Harwell, Didcot, Oxfordshire OX11 0RH, UK
*
*E-mail: John.Dawson@amec.com
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Abstract

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The current route in the UK for the conditioning and immobilization of most intermediate level waste for interim storage and geological disposal is to encapsulate in a cementitious matrix. However, certain waste materials, such as those containing reactive metals (e.g. uranium and aluminium), can corrode in the presence of the highly alkaline water in a cementitious environment. In their initial, undegraded form, polymeric materials can provide the appropriate, unreactive environment needed for the encapsulation of chemically active metals.

This study examines the effects of gamma radiation on the stability of six candidate polymeric encapsulants, including a vinyl ester styrene resin (VES) and five epoxy resin formulations. The polymeric encapsulants were exposed to radiation doses up to 10 MGy using AMEC's cobalt-60 gamma irradiation facility and their radiation and chemical stability characterized by the use of a number of analytical techniques. These included flexural and compressive testing, Fourier transform infrared spectroscopy (FTIR), gel fraction, leach testing and gas evolution. The results show that the most stable resin in terms of radiation resistance and chemical stability was VES. Most of the epoxy resin materials also showed good generic stability, but the FTIR analysis showed the potential for dose-rate effects in one formulation.

Keywords

polymeric encapsulantsradiationdose-rate effects
Type
Research Article
Information
Mineralogical Magazine , Volume 76 , Issue 8 , December 2012 , pp. 2985 - 2994
Creative Commons
Creative Common License - CCCreative Common License - BY
© [2012] The Mineralogical Society of Great Britain and Ireland. This is an open access article distributed under the terms of the Creative Commons Attribution (CC BY) licence (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 2012

References

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