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Radiochimica Acta

International Journal for chemical aspects of nuclear science and technology

Ed. by Qaim, Syed M.

12 Issues per year

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Speciation of technetium(IV) chloride under gamma irradiation

M. Fattahi / L. Vichot / F. Poineau / C. Houée-Levin / B. Grambow

Citation Information: Radiochimica Acta. Volume 93, Issue 7, Pages 409–413, ISSN (Print) 0033-8230, DOI: 10.1524/ract.2005.93.7.409, September 2009

Publication History

Received:
July 23, 2004
Accepted:
January 21, 2005
Published Online:
2009-09-25

Abstract

Speciation of Tc in aqueous solution is a complex phenomenon because several parameters intervene simultaneously. We show under gamma radiations, it is completely modified. At pH 8.5 TcO2 is oxidized to Tc(VII) with a yield of 1.38×10−7 mol J−1. At pH 1.5, it was demonstrated that Tc is present as hydroxylated species TcnOy(4n-2y)+ (L. Vichot, M. Fattahi, M. Musikas: Radiochim. Acta 91, 263 (2003)). Its oxidation leads also to Tc(VII) with an experimental yield of 1.45×10−7 mol J−1. In more acidic solutions, results are consistent with hydrolysis and oxidation of Tc(IV) to Tc(V). As for colloidal solutions of Tc(IV) or TcO2, they give Tc(VII) whereas solutions of TcCl62- at pH 0.5 and 1.5 do not lead directly to Tc(VII). Reduced states of Tc are very sensitive to radiation. Hydrolysis as well as polymerisation of Tc are accelerated. Furthermore the radiolytic processes are pH dependent.

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