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- W2051234133 abstract "Measurements of Pb and S isotopes with precision of better than 1 permil have been achieved using AUSTRALIS (A.M.S. for Ultra Sensitive TRAce eLement and Isotopic Studies), a microbeam AMS system based on a 3 MV Tandetron at the HIAF laboratory. The high precision is made possible by a fast bouncing system both at the low and the high energy ends, to counter the effect of instabilities in the ion source and beam transport system. The system is aimed at enabling in situ microanalysis of geological samples for radiogenic and stable isotope data free from molecular and isobaric interferences. The microbeam source, developed from a HICONEX source, produces a 30 μm diameter Cs+ beam routinely, and includes a high magnification sample viewing system in the reflected geometry, facilitating sample positioning and tuning of the primary beam. Measurements were conducted at 1.5–2 MV terminal voltage. Lead isotopes are measured as Pb4+ ions, from PbS− injected ions. Sulfur isotopes are measured as S2+ or S3+ ions from injected S− ions. Fractionation effects still vary ∼2% over longer periods, attributable to the slight variation in some manual controls of the accelerator. This is expected to be improved when all controls are brought under computer control." @default.
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- W2051234133 date "2000-10-01" @default.
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- W2051234133 title "Precision Pb and S isotopic ratio measurements by microbeam AMS" @default.
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- W2051234133 doi "https://doi.org/10.1016/s0168-583x(00)00115-4" @default.
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