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Preparation of Helium Isotope-certified Reference Materials by Gravimetry
James Tshilongo,민들래,이진복,김진석 대한화학회 2015 Bulletin of the Korean Chemical Society Vol.36 No.2
An advanced gravimetric system was used to produce certified reference materials of mixtures of helium isotopes, traceable to the Système International d'Unitès (SI unit) of moles. Critical factors in developing isotope reference mixtures include the purity assessment of the source gases before preparation, the weighing system used for gravimetric mixing, a well-developed gas filling system, and internal consistency among the mixtures. Three artificial helium isotope reference mixtures were prepared with absolute isotope ratios, R(4He/ 3He), of 18.905 ± 0.036, 98.78 ± 0.21, and 209.82 ± 0.44 (k = 1), respectively. The internal consistency between the mixtures was verified using a precision single-focusing magnetic sector-type mass spectrometer with a dynamic inlet system. The results showed that the proportions of the three reference isotope mixtures were well within the measurement uncertainty. The isotope reference mixtures were produced with the highest metrological uncertainty level.
International comparison CCQM-K113-noble gas mixture
Lim, Jeong Sik,Lee, Jinbok,Moon, Dongmin,Tshilongo, James,Qiao, Han,Shuguo, Hu,Tiqiang, Zhang,Kelley, Michael E,Rhoderick, George C,Konopelko, L A,Kolobova, A V,Vasserman, I I,Zavyalov, S V,Gromova, E BUREAU INTERNATIONAL DES POIDS ET MESURES 2017 METROLOGIA -BERLIN- Vol.54 No.1