The work presented in this article concerns the development of a method for the determination of selenium-79 in fission product (FP) solutions resulting from nuclear fuel reprocessing. 79 Se (T 1/2 ~10 6 y) was measured using electrothermal vaporisation coupled with inductively coupled plasma mass spectrometry (ETV-ICP/MS) after a single chemical separation step to extract Se from the high activity solution (10 10 Bq l 21 ). The results showed that the ion exchange method produced a solution sufficiently decontaminated with respect to major b/c emitters and had a significant selenium recovery yield (85%). ETV parameters, for example furnace program, quantity of palladium nitrate used as chemical modifier, and gas flow rates, were optimised. The association of ETV and chemical separation eliminated all the interferences normally associated with the determination of 79 Se. The concentration of 79 Se measured in the fission products solution was 0.43 mg l 21 . 38
A new value of 126Sn half-life was determined by combination of inductively coupled plasma-mass spectrometry (ICP-MS) and gamma spectrometry measurements on purified sample solutions collected from nuclear fuel reprocessing. 126Sn was isolated through dissolution of fission product precipitates and liquid-liquid extraction with N-benzoyl-N-phenyl-hydroxylamine (BPHA). The abundance of 126Sn atoms together with the absence of interfering species in the analysed solutions made it possible to measure both mass concentration and nuclide activity with high precision and accuracy. This led to a 126Sn half-life value of 1.980(57)×105 a.
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