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The requirement for proper storage of nuclear and related decommissioning samples to safeguard accuracy of tritium data

The requirement for proper storage of nuclear and related decommissioning samples to safeguard accuracy of tritium data
The requirement for proper storage of nuclear and related decommissioning samples to safeguard accuracy of tritium data
Large volumes of potentially tritium-contaminated waste materials are generated during nuclear decommissioning that require accurate characterisation prior to final waste sentencing. The practice of initially determining a radionuclide waste fingerprint for materials from an operational area is often used to save time and money but tritium cannot be included because of its tendency to be chemically mobile. This mobility demands a specific measurement for tritium and also poses a challenge in terms of sampling, storage and reliable analysis. This study shows that the extent of any tritium redistribution during storage will depend on its form or speciation and the physical conditions of storage. Any weakly or moderately bound tritium (e.g. adsorbed water, waters of hydration or crystallisation) may be variably lost at temperatures over the range 100–300 °C whereas for more strongly bound tritium (e.g. chemically bound or held in mineral lattices) the liberation temperature can be delayed up to 800 °C. For tritium that is weakly held the emanation behaviour at different temperatures becomes particularly important. The degree of 3H loss and cross-contamination that can arise after sampling and before analysis can be reduced by appropriate storage. Storing samples in vapour tight containers at the point of sampling, the use of triple enclosures, segregating high activity samples and using a freezer all lead to good analytical practice.
accurate tritium analysis, weakly bound tritium, strongly bound tritium, cross contamination, proper sample storage condition
0304-3894
292-298
Kim, Daeji
c4e820fe-d29a-4594-9a51-9cee28cc8038
Croudace, Ian W.
24deb068-d096-485e-8a23-a32b7a68afaf
Warwick, Phillip E.
9fd1f869-13d1-4b61-8cd3-fe358d3b70ea
Kim, Daeji
c4e820fe-d29a-4594-9a51-9cee28cc8038
Croudace, Ian W.
24deb068-d096-485e-8a23-a32b7a68afaf
Warwick, Phillip E.
9fd1f869-13d1-4b61-8cd3-fe358d3b70ea

Kim, Daeji, Croudace, Ian W. and Warwick, Phillip E. (2012) The requirement for proper storage of nuclear and related decommissioning samples to safeguard accuracy of tritium data. Journal of Hazardous Materials, 213-214, 292-298. (doi:10.1016/j.jhazmat.2012.01.094). (PMID:22405609)

Record type: Article

Abstract

Large volumes of potentially tritium-contaminated waste materials are generated during nuclear decommissioning that require accurate characterisation prior to final waste sentencing. The practice of initially determining a radionuclide waste fingerprint for materials from an operational area is often used to save time and money but tritium cannot be included because of its tendency to be chemically mobile. This mobility demands a specific measurement for tritium and also poses a challenge in terms of sampling, storage and reliable analysis. This study shows that the extent of any tritium redistribution during storage will depend on its form or speciation and the physical conditions of storage. Any weakly or moderately bound tritium (e.g. adsorbed water, waters of hydration or crystallisation) may be variably lost at temperatures over the range 100–300 °C whereas for more strongly bound tritium (e.g. chemically bound or held in mineral lattices) the liberation temperature can be delayed up to 800 °C. For tritium that is weakly held the emanation behaviour at different temperatures becomes particularly important. The degree of 3H loss and cross-contamination that can arise after sampling and before analysis can be reduced by appropriate storage. Storing samples in vapour tight containers at the point of sampling, the use of triple enclosures, segregating high activity samples and using a freezer all lead to good analytical practice.

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More information

e-pub ahead of print date: 15 February 2012
Published date: 30 April 2012
Keywords: accurate tritium analysis, weakly bound tritium, strongly bound tritium, cross contamination, proper sample storage condition
Organisations: Geochemistry

Identifiers

Local EPrints ID: 354431
URI: http://eprints.soton.ac.uk/id/eprint/354431
ISSN: 0304-3894
PURE UUID: c9eaa439-bcfa-4b84-a703-91e0adbd3c38

Catalogue record

Date deposited: 10 Jul 2013 15:48
Last modified: 16 Jul 2019 21:29

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