The external reproducibility (2 σ SD ) of Ca stable isotope ratio measurements ( δ 44/40 Ca) using double-spike ( ⁴³ Ca– ⁴⁸ Ca) thermal ionization mass spectrometry (TIMS) is better than 0.08 ‰ using our proposed loading technique.
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Mondal et al. (2017) studied this question.
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