Hernández-Mendiola, E.; Bernal, Juan Pablo; Lounejeva, E.; Mortimer, Graham; McCulloch, Malcolm Thomas
We describe an analytical methodology to quantify238U-234U and230Th using isotope-dilution systematics and inductively coupled plasma-quadrupole mass spectrometry (ICP-QMS) for geochronological purposes. This required characterization of the mass spectrometer detector performance over a large dynamic range, including a careful calibration between pulse and analogue ion-counting modes. Our methodology gives an analytical precision for234U/238U and230Th/238U of 4‰ and 7‰ (2 × standard error),...[Show more]
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