Determination of 90Sr/ 238U ratio by double isotope dilution inductively coupled plasma mass spectrometer with multiple collection in spent nuclear fuel samples with in situ 90Sr/ 90Zr separation in a collision-reaction cell - Isnard, H.; Aubert, M.; Blanchet, P.; Brennetot, R.; Chartier, F.; Geertsen, V.; Manuguerra, F. (Spectrochimica Acta Part B, 2006)