Carbonate and silicate intercomparison materials for cosmogenic 36Cl measurements

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dc.contributor.authorMechernich, Sen_AU
dc.contributor.authorDunai, TJen_AU
dc.contributor.authorBinnie, SAen_AU
dc.contributor.authorGoral, Ten_AU
dc.contributor.authorHeinze, Sen_AU
dc.contributor.authorDewald, Aen_AU
dc.contributor.authorSchimmelpfennig, Ien_AU
dc.contributor.authorKeddadouche, Ken_AU
dc.contributor.authorAumaître, Gen_AU
dc.contributor.authorBourlès, Den_AU
dc.contributor.authorMarrero, Sen_AU
dc.contributor.authorWilcken, KMen_AU
dc.contributor.authorSimon, KJen_AU
dc.contributor.authorFink, Den_AU
dc.contributor.authorPhillips, FMen_AU
dc.contributor.authorCaffee, Men_AU
dc.contributor.authorGregory, LCen_AU
dc.contributor.authorPhillips, Ren_AU
dc.contributor.authorFreeman, SPHTen_AU
dc.contributor.authorShanks, Ren_AU
dc.contributor.authorSarikaya, MAen_AU
dc.contributor.authorPavetich, Sen_AU
dc.contributor.authorRugel, Gen_AU
dc.contributor.authorMerchel, Sen_AU
dc.contributor.authorAkçar, Nen_AU
dc.contributor.authorYesilyurt, Sen_AU
dc.contributor.authorIvy-Ochs, Sen_AU
dc.contributor.authorVockenhuber, Cen_AU
dc.date.accessioned2020-12-09T21:36:14Zen_AU
dc.date.available2020-12-09T21:36:14Zen_AU
dc.date.issued2019-09-15en_AU
dc.date.statistics2020-12-01en_AU
dc.description.abstractTwo natural mineral separates, labeled CoCal-N and CoFsp-N, have been prepared to serve as intercomparison material (ICM) for in situ-produced cosmogenic 36Cl and natural chlorine (Clnat) analysis. The sample CoCal-N is derived from calcite crystals in a Namibian lag deposit, while the sample CoFsp-N is derived from a single crystal of alkali-feldspar from a Namibian pegmatite. The sample preparation took place at the University of Cologne and a rotating splitter was used to obtain homogeneous splits of both ICMs. Forty-five measurements of CoCal-N (between 1 and 16 per facility) and forty-four measurements of CoFsp-N (between 2 and 20 per facility) have been undertaken by ten target preparation laboratories measured by seven different AMS facilities. The internal laboratory scatter of the 36Cl concentrations indicates no overdispersion for half of the laboratories and 3.9 to 7.3% (1σ) overdispersion for the others. We show that the CoCal-N and CoFsp-N splits are homogeneous regarding their 36Cl and Clnat concentrations. The grand average (average calculated from the average of each laboratory) yields initial consensus 36Cl concentrations of (3.74 ± 0.10) × 106 at 36Cl/g (CoCal-N) and (2.93 ± 0.07) × 106 at 36Cl/g (CoFsp-N) at 95% confidence intervals. The coefficient of variation is 5.1% and 4.2% for CoCal-N and CoFsp-N, respectively. The Clnat concentration corresponds to the lower and intermediate range of typical rock samples with (0.73 ± 0.18) µg/g in CoCal-N and (73.9 ± 6.8) µg/g in CoFsp-N. We discuss the most relevant points of the sample preparation and measurement and the chlorine concentration calculation to further approach inter-laboratory comparability. We propose to use continuous measurements of the ICMs to provide a valuable quality control for future determination of 36Cl and Clnat concentrations. © 2019 Elsevier B.V.en_AU
dc.identifier.citationMechernich, S., Dunai, T. J., Binnie, S. A., Goral, T., Heinze, S., Dewald, A., Schimmelpfennig, I., Keddadouche, K., Aumaître, G., Bourlès, D., Marrero, S., Wilcken, K., Simon, K., Fink, D., Phillips, F. M., Caffee, M. C., Gregory, L. C., Phillips, R., Freeman, S. P. H. T., Shanks, R., Sarikaya, M. A., Pavetich, S., Rugel, G., Merchel, S., Akçar, N., Yesilyurt, S., Ivy-Ochs, S. & Vockenhuber, C. (2019). Carbonate and silicate intercomparison materials for cosmogenic 36Cl measurements. Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms, 455, 250-259. doi:10.1016/j.nimb.2019.01.024en_AU
dc.identifier.issn0168-583Xen_AU
dc.identifier.journaltitleNuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atomsen_AU
dc.identifier.pagination250-259en_AU
dc.identifier.urihttps://doi.org/10.1016/j.nimb.2019.01.024en_AU
dc.identifier.urihttps://apo.ansto.gov.au/dspace/handle/10238/10090en_AU
dc.identifier.volume455en_AU
dc.language.isoenen_AU
dc.publisherElsevieren_AU
dc.subjectCalciteen_AU
dc.subjectChlorineen_AU
dc.subjectFeldsparsen_AU
dc.subjectLaboratoriesen_AU
dc.subjectSilicatesen_AU
dc.subjectStatistical modelsen_AU
dc.subjectSpectroscopyen_AU
dc.subjectMonocrystalsen_AU
dc.titleCarbonate and silicate intercomparison materials for cosmogenic 36Cl measurementsen_AU
dc.typeJournal Articleen_AU
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