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Radiocarbon measurements in cemented ion-exchange resins

Published online by Cambridge University Press:  28 March 2012

Stasys Motiejunas ,
Algirdas Vaidotas ,
Jonas Mazeika ,
Zana Skuratovic  and
Violeta Vaitkeviciene
Stasys Motiejunas
Affiliation:
Radioactive Waste Management Agency (RATA), Algirdo str. 31, Vilnius, LT–03219, Lithuania
Algirdas Vaidotas
Affiliation:
Radioactive Waste Management Agency (RATA), Algirdo str. 31, Vilnius, LT–03219, Lithuania
Jonas Mazeika
Affiliation:
Nature Research Centre, T. Sevcenkos str. 13, Vilnius, LT-03223, Lithuania
Zana Skuratovic
Affiliation:
Nature Research Centre, T. Sevcenkos str. 13, Vilnius, LT-03223, Lithuania
Violeta Vaitkeviciene
Affiliation:
Nature Research Centre, T. Sevcenkos str. 13, Vilnius, LT-03223, Lithuania
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Abstract

A large amount of liquid radioactive waste has been generated at the Ignalina Nuclear Power Plant (NPP), Lithuania, during its operation. The contaminated liquids are treated with ion exchange-resins, which will generate significant waste stream for cementation. The cemented waste will be disposed of in a near-surface repository. The preliminary safety assessment uncovered that 14C is the most significant radionuclide affecting long-term safety of the closed repository. The method of combined acid striping and wet oxidation with subsequent catalytic combustion has been applied for 14C measurements in cemented ion-exchange resins. It allows separating organic and inorganic compounds from the same sample. At first, the inorganic fraction was extracted by adding acid to the sample followed by absorption of CO2 in a pair of alkali gas washed traps. The remaining carbon was extracted by application of a strong oxidizer. The preliminary results show that activity concentration of 14C in the solidified waste has an order of magnitude of tens and hundreds Bq per gram.

Type
Articles
Information
MRS Online Proceedings Library (OPL) , Volume 1475: Symposium NW – Scientific Basis for Nuclear Waste Management XXXV , 2012 , imrc11-1475-nw35-o32
Copyright
Copyright © Materials Research Society 2012

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References

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