Uranium-series geochemistry by Bernard Bourdon

By Bernard Bourdon

The problem of destiny instrumentation

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These sensitivities are comparable to traditional methods of alpha spectrometry. [Used by permission of Elsevier Science, from Eikenberg et al. (2001), J Environ Radioact, Vol. 54, Fig. 4, p. 117] ȱ TechniquesȱforȱMeasuringȱUȬseriesȱNuclides:ȱ1992Ȭ2002ȱ 29ȱ geological applications. , Po-210 (Rubin et al. 1994) and Ac-227 (Martin et al. 1995)). , Dacheux and Aupiais 1997). These methods combine chemical separation by liquid-liquid extraction with measurement of alpha activity by liquid scintillation.

1992), ideally matching the matrix to be analysed, also allow one to evaluate U-series measurement accuracy. Methods for preparing U-series tracer isotopes vary according to element, but generally involve nuclear reactions to provide the radioactive tracers of interest. Preparation of the tracer is particularly an issue for protactinium, since the only option for mass spectrometric measurement (233Pa) has a short half-life (27 d) and must be replenished frequently (Pickett et al. 1994; Bourdon et al.

2 mBq/L (6 fg 226Ra/L) for 226Ra and 224Ra for a one-week counting period. These sensitivities are comparable to traditional methods of alpha spectrometry. [Used by permission of Elsevier Science, from Eikenberg et al. (2001), J Environ Radioact, Vol. 54, Fig. 4, p. 117] ȱ TechniquesȱforȱMeasuringȱUȬseriesȱNuclides:ȱ1992Ȭ2002ȱ 29ȱ geological applications. , Po-210 (Rubin et al. 1994) and Ac-227 (Martin et al. 1995)). , Dacheux and Aupiais 1997). These methods combine chemical separation by liquid-liquid extraction with measurement of alpha activity by liquid scintillation.

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