Heuser, Alexander , Eisenhauer, Anton , Gussone, Nikolaus, Bock, Barbara, Hansen, B. T. and Nägeler, Thomas F. (2002) Measurement of calcium isotopes (δ44Ca) using a multicollector TIMS technique. International Journal of Mass Spectrometry, 220 (3). pp. 385-397. DOI 10.1016/S1387-3806(02)00838-2.

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Abstract

We propose a new“multicollector technique” for the thermal ionization mass spectrometer (TIMS) measurement of calcium (Ca) isotope ratios improving average internal statistical uncertainty of the 44Ca/40Ca measurements by a factor of 2–4 and average sample throughput relative to the commonly used “peak jumping method” by a factor of 3. Isobaric interferences with potassium (40K+) and titanium (48Ti+) or positively charged molecules like 24Mg19F+, 25Mg19F+, 24Mg16O+ and 27Al16O+ can either be corrected or are negligible. Similar, peak shape defects introduced by the large dispersion of the whole Ca isotope mass range from 40–48 atomic mass units (amu) do not influence Ca-isotope ratios. We use a 43Ca/48Ca double spike with an iterative double spike correction algorithm for precise isotope measurements

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