Probing the 186Os/188Os Precision Barrier: New Recommended Values for the DROsS Reference Material and an Assessment of Mixed 1011 and 1012 Ω Amplifier Arrays
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Probing the 186Os/188Os Precision Barrier : New Recommended Values for the DROsS Reference Material and an Assessment of Mixed 1011 and 1012 Ω Amplifier Arrays. / Waterton, Pedro; Woodland, Sarah; Pearson, Graham; Serre, Simon Hansen; Szilas, Kristoffer.
I: Geostandards and Geoanalytical Research, Bind 48, Nr. 1, 2024, s. 109-132.Publikation: Bidrag til tidsskrift › Tidsskriftartikel › Forskning › fagfællebedømt
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TY - JOUR
T1 - Probing the 186Os/188Os Precision Barrier
T2 - New Recommended Values for the DROsS Reference Material and an Assessment of Mixed 1011 and 1012 Ω Amplifier Arrays
AU - Waterton, Pedro
AU - Woodland, Sarah
AU - Pearson, Graham
AU - Serre, Simon Hansen
AU - Szilas, Kristoffer
PY - 2024
Y1 - 2024
N2 - We present high precision negative ion thermal ionisation mass spectrometry (N-TIMS) Os isotope measurement results for the DROsS reference material, to investigate the limits on the precision of TIMS-based 186Os/188Os measurements. We use analytical conditions previously highlighted to optimise precision, present a new flexible data processing protocol, and measure 184Os on a Faraday Cup equipped with a 1012 Ω amplifier. Despite analytical protocols that minimise uncertainty from counting statistics and Johnson-Nyquist noise, the intermediate measurement precision of our approach does not significantly improve on previous high precision Os isotope measurements, with the exception of 184Os/188Os. This is probably due to uncertainties in measured amplifier gain factors, which are greater when using mixed arrays of 1011 and 1012 Ω amplifiers than when using 1011 Ω amplifiers alone, though Faraday Cup deterioration could also contribute. We propose that multi-dynamic Os isotope measurements could largely eliminate both of these uncertainties. Our 184Os/188Os measurement results are the most precise yet, yielding 184Os/188Os = 0.0013036 ± 0.0000007 (2s, n = 38). Additionally, we average our data with published data to recommend the following composition for DROsS: 186Os/188Os = 0.1199319 ± 0.0000024, 187Os/188Os = 0.1609227 ± 0.0000022, 189Os/188Os = 1.219709 ± 0.000010, 190Os/188Os = 1.983793 ± 0.000011.Supporting Information
AB - We present high precision negative ion thermal ionisation mass spectrometry (N-TIMS) Os isotope measurement results for the DROsS reference material, to investigate the limits on the precision of TIMS-based 186Os/188Os measurements. We use analytical conditions previously highlighted to optimise precision, present a new flexible data processing protocol, and measure 184Os on a Faraday Cup equipped with a 1012 Ω amplifier. Despite analytical protocols that minimise uncertainty from counting statistics and Johnson-Nyquist noise, the intermediate measurement precision of our approach does not significantly improve on previous high precision Os isotope measurements, with the exception of 184Os/188Os. This is probably due to uncertainties in measured amplifier gain factors, which are greater when using mixed arrays of 1011 and 1012 Ω amplifiers than when using 1011 Ω amplifiers alone, though Faraday Cup deterioration could also contribute. We propose that multi-dynamic Os isotope measurements could largely eliminate both of these uncertainties. Our 184Os/188Os measurement results are the most precise yet, yielding 184Os/188Os = 0.0013036 ± 0.0000007 (2s, n = 38). Additionally, we average our data with published data to recommend the following composition for DROsS: 186Os/188Os = 0.1199319 ± 0.0000024, 187Os/188Os = 0.1609227 ± 0.0000022, 189Os/188Os = 1.219709 ± 0.000010, 190Os/188Os = 1.983793 ± 0.000011.Supporting Information
U2 - 10.1111/ggr.12532
DO - 10.1111/ggr.12532
M3 - Journal article
VL - 48
SP - 109
EP - 132
JO - Geostandards and Geoanalytical Research
JF - Geostandards and Geoanalytical Research
SN - 1639-4488
IS - 1
ER -
ID: 372802067