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Interactions Between Np-Doped Synroc and Boom Clay

Published online by Cambridge University Press:  15 February 2011

K. P. Hart,
B. J. Robinson,
T. E. Payne,
P. Van Iseghem and
K. Lemmens
K. P. Hart
Affiliation:
Australian Nuclear Science and Technology Organisation (ANSTO) Private Mail Bag 1, Menai, New South Wales, Australia, 2234.
B. J. Robinson
Affiliation:
Australian Nuclear Science and Technology Organisation (ANSTO) Private Mail Bag 1, Menai, New South Wales, Australia, 2234.
T. E. Payne
Affiliation:
Australian Nuclear Science and Technology Organisation (ANSTO) Private Mail Bag 1, Menai, New South Wales, Australia, 2234.
P. Van Iseghem
Affiliation:
S.C.K./C.E.N., Boeretang 200, B–2400 Mol, Belgium.
K. Lemmens
Affiliation:
S.C.K./C.E.N., Boeretang 200, B–2400 Mol, Belgium.
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Abstract

Leaching experiments with deionised water at 70°C have been carried out to ascertain the effect of oxidising and anaerobic conditions and the presence of Boom clay on Np release from Synroc.

The normalised solution leach rates of Np measured in these experiments are about a factor of 10 lower under reducing conditions than oxidising conditions and the presence of Boom clay was found not to enhance the leaching of Np from Synroc. Neptunium was found to be predominantly in the mobile fraction and was not removed from the leaching solutions significantly by filtration or ultrafiltration.

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References

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