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High precision Faraday collector MC-ICPMS thorium isotope ratio determination by Emma-Kate Potter; Claudine H. Stirling; Morten B. Andersen; Alex N. Halliday is a Chemistry article available to read on EtoBox.

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Uranium-series dating of carbonate materials requires precise determination of the spike sample thorium isotope ratio, 230 Th/ 229 Th. This ratio is commonly measured using ion counting techniques, however the precision of analyses using ion counting devices suffers from beam intensity limitations, drift in multiplier gain and non-linearities in electron multiplier response. Here, we describe the application of multiple-collector inductively coupled plasma mass spectrometry (MC-ICPMS) to determine thorium isotope ratios at hitherto unattained precision. For the first time, thorium isotope analyses were performed using only Faraday collectors coupled to 10 11 feedback resistors in the amplifier system. Spiked thorium solutions were concentrated to produce 230 Th and 229 Th signal intensities of around 50 mV and 100 mV, respectively (across a 10 11 resistor) and are run at high intensity for a short period of time (∼1 min). These analyses yield a 230 Th/ 229 Th external reproducibility of better than 0.3‰ for ∼25-30 pg of consumed 230 Th. This is a factor of two better than the best published thermal ionisation mass spectrometry (TIMS) and MC-ICPMS techniques for similar sample sizes

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Author

Emma-Kate Potter; Claudine H. Stirling; Morten B. Andersen; Alex N. Halliday

Publisher

Elsevier Science; Elsevier ; Elsevier BV (ISSN 1387-3806)

Published

2005

Language

EN

Field

Chemistry (Physical Sciences)