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Adsorption of actinides within speleothems

Published online by Cambridge University Press:  02 January 2018

P. Sengupta ,
J. Sanwal ,
N. L. Dudwadkar ,
S. C. Tripathi  and
P. M. Gandhi
P. Sengupta*
Affiliation:
Materials Science Division, Bhabha Atomic Research Centre, Mumbai 400 085, India
J. Sanwal
Affiliation:
Geodynamics Unit, Jawaharlal Nehru Centre for Advanced Scientific Research, Bangalore 560064, India
N. L. Dudwadkar
Affiliation:
Fuel Reprocessing Division, Bhabha Atomic Research Centre, Mumbai 400 085, India
S. C. Tripathi
Affiliation:
Fuel Reprocessing Division, Bhabha Atomic Research Centre, Mumbai 400 085, India
P. M. Gandhi
Affiliation:
Fuel Reprocessing Division, Bhabha Atomic Research Centre, Mumbai 400 085, India
*
E-mail: [email protected]
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Abstract

Stalagmites and stalactites, as observed within natural caves, may develop inside geological repositories during constructional and post-operational periods. It is therefore important to understand actinide sorption within such materials. Towards this, experimental studies were carried out with 233U, 238Np (VI), 238Np (IV), 239Pu and 241Am radiotracers using natural speleothem samples collected from the Dharamjali cave of the Kumaon Lesser Himalayas, India. Petrological/mineralogical studies showed that natural speleothems have three general domains: (1) columnar calcite; (2) microcrystalline calcite; and (3) botryoidal aragonite – each with ferruginous materials. Results showed that all domains of speleothems can take up >99% actinides, irrespective of valence state and pH (1–6 range) of the solution. However, distribution coefficients were found to be at a maximum in aragonite for most of the actinides. Such data are very important for long-term performance and safety assessments of the deep geological repositories planned for the disposal of high-level nuclear wastes.

Keywords

speleothemgeological repositorynuclear waste disposalactinidessorption
Type
Research Article
Information
Mineralogical Magazine , Volume 80 , Issue 5 , August 2016 , pp. 765 - 780
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 2016

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