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Determining the  129 I concentration, a long-lived radionuclide present in spent nuclear fuel, is a major issue for nuclear waste disposal purpose.  129 I also has to be measured in numerous environmental, nuclear and biological samples. To be able to accurately determine the  129 I concentration, an analytical method based on the use of a multicollector-inductively coupled plasma mass spectrometer (MC-ICPMS) combined with an isotope dilution technique using an  127 I spike, was developed. First, the influence of different media (HNO 3 , NaOH and TMAH) on natural  127 I signal intensity and stability and on memory effects was studied. Then an analytical procedure was developed by taking into account the correction of blanks and interferences. Tellurium was chosen for instrumental mass bias correction, as no certified standards with suitable  127 I/ 129 I ratio are available. Finally, the results, reproducibility and uncertainties obtained for the  129 I concentration determined by isotope dilution with a  127 I spike are presented and discussed. The final expanded relative uncertainty obtained for the iodine-129 concentration was lower than 0.7% ( k  = 1). This precise  129 I determination in association with further activity measurements of this nuclide on the same sample will render it possible to determine a new value of the  129 I half-life with a reduced uncertainty (0.76%,  k  = 1).

Accurate measurements of 129 I concentration by isotope dilution using MC-ICPMS for half-life determination