Eu isotope data of NIST3117a standard reagent for determination of Eu isotope fractionation in geological rocks using MC-ICP-MS

The data presented in this work summarize the results of Eu isotope ratio of NIST3117a standard reagent collected between December 2017 and July 2020, which were used standard isotope ratio for calculating delta notation of Eu isotope ratio in the geological rocks [1,2]. The Eu isotope ratio of NIST3117a using MC-ICP-MS was measured by conventional standard-sample-bracketing (SSB) and combined standard-sample bracketing and internal normalization (C-SSBIN) for comparison. Sm was used as a spike element for normalization in determining Eu isotope ratio. The purpose of data collection was to check homogeneity and stability of Eu isotope ratio for NIST3117a Eu standard reagent for determining Eu isotope fractionation in the various kinds of geological materials. The data can be used as bench mark for Eu isotope standard reagent for determining the degree of Eu isotope fractionation in the geological materials.