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    NTHUR > Presidents > Shen, Jason Jiun-San (1994-1997) > SJJS Journal / Magazine Articles  >  Absolute Ca isotopic measurement using an improved double spike technique

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    Title: Absolute Ca isotopic measurement using an improved double spike technique
    Authors: Shen, J.J.;D.C. Lee;W.T. Liang
    Teacher: 沈君山
    Date: 2009
    Publisher: 中華民國地球科學學會
    Relation: TERRESTRIAL ATMOSPHERIC AND OCEANIC SCIENCES, 中華民國地球科學學會, Volume 20, Issue 3, JUN 2009, Pages 455-464
    Keywords: Calcium isotope
    Double spike
    Absolute isotope ratio
    Abstract: A new vector analytical method has been developed in order to obtain the true isotopic composition of the (42)Ca-(48)Ca double spike. This is achieved by using two different sample-spike mixtures combined with the double spike and natural Ca data. Because the natural sample (two mixtures) and the spike should all lie on a single mixing line, we are able to constrain the true isotopic composition of our double spike using this new approach. Once the isotopic composition of the Ca double spike is established, we are able to obtain the true Ca isotopic composition of the NIST Ca standard SRM915a, (40)Ca/(44)Ca = 46.537 +/- 2 (2 sigma(m), n = 55), (42)Ca/(44)Ca = 0.31031 +/- 1, (43)Ca/(44)Ca = 0.06474 +/- 1, and (48)Ca/(44)Ca = 0.08956 +/- 1. Despite an offset of 1.3% in (40)Ca/(44)Ca between our result and the previously reported value (Russell et al. 1978), Our data indicate all offset of 1.89 parts per thousand in (40)Ca/(44)Ca between SRM915a and seawater, entirely consistent with the published results.
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    Appears in Collections:[Shen, Jason Jiun-San (1994-1997)] SJJS Journal / Magazine Articles
    [Department of Physics] PHYS Journal / Magazine Articles

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