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Inherent isotope dilution analysis of237Np in spent nuclear fuels

Authors:	T Adachi K Kammerichs L Koch

Institution:	(1) Joint Research Centre, Karlsruhe Establishment, European Institute for Transuranium Elements, Commission of the European Communities, P. O. Box 2340, 7500 Karlsruhe, Germany;(2) Present address: On leave from Japan Atomic Energy Research Institute, Tokai-mura, Japan

Abstract:	A combined -spectrometric and mass-spectrometric determination of²³⁷Np in spent nuclear fuels using²³⁹Np as an inherent spike has been developed. In spent fuel²³⁹Np is in radiochemical equilibrium with²⁴³Am. Neptunium in the tetravalent state is separated by TTA solvent extraction from the other actinides and most of the fission products and the -activity ratio of²³⁷Np to²³⁹Np is measured. The²³⁷Np activity is via²³⁹Np directly linked to the²⁴³Am mass in a sample, which is determined by mass-spectrometric isotope dilution analysis.

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