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- W2058799781 abstract "We present a method for the calibration of in-house thorium isotope standards for use in U–Th chronology, along with an assessment of instrumental biases on the Nu Plasma multi-collector inductively-coupled-plasma mass spectrometer. Uranium and thorium mass fractionation is found to be very strongly coupled, with no evidence of differences in mass bias behaviour. Both Th-isotope and U–Th fractionation are most closely approximated by a linear-law fractionation model. Any deviations from linear law are at the sub-permil level. We also investigate potential biases introduced by intensity-dependant, and ion-beam-path dependant variations in ion-counter response. At count rates <∼350,000 counts per second, intensity-dependant gain variation can be accounted for entirely by dead-time, while beam-path differences can cause gain variation of up to ∼0.8% for different Th isotopes. If this beam-path bias is to be adequately corrected, ion-counter measurements of Th-isotope ratios must be made with reference to bracketing Th-isotope standards measured in the same configuration." @default.
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- W2058799781 date "2010-07-01" @default.
- W2058799781 modified "2023-09-26" @default.
- W2058799781 title "Correction of multi-collector-ICP-MS instrumental biases in high-precision uranium–thorium chronology" @default.
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- W2058799781 doi "https://doi.org/10.1016/j.ijms.2010.06.016" @default.
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