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The method includes the chemical separation of Zr (isobaric interference of <jats:sup>90<\/jats:sup>Zr) from the samples followed by determination of <jats:sup>90<\/jats:sup>Sr\/<jats:sup>88<\/jats:sup>Sr abundance\u00a0 sensitivity (2.1\u2009\u00d7\u200910<jats:sup>\u221210<\/jats:sup>). The analytical performance of this method was assessed in the IAEA-TEL 2017-3 worldwide open proficiency test. For <jats:sup>90<\/jats:sup>Sr determination, tap water and milk powder samples were distributed amongst the participant laboratories with reference values of 11.2\u2009\u00b1\u20090.3\u2009Bq\u2009kg<jats:sup>\u22121<\/jats:sup> (2.2\u2009\u00b1\u20090.1 fg g<jats:sup>\u22121<\/jats:sup>) and 99.9\u2009\u00b1\u20095.0\u2009Bq\u2009kg<jats:sup>\u22121<\/jats:sup> (19.5\u2009\u00b1\u20091.0 fg g<jats:sup>\u22121<\/jats:sup>), respectively. The stable Sr concentrations were 39.4\u2009\u00b1\u20090.9\u2009ng\u2009g<jats:sup>\u22121<\/jats:sup> and 2.5\u2009\u00b1\u20090.1\u2009\u00b5g\u2009g<jats:sup>\u22121<\/jats:sup> while the <jats:sup>90<\/jats:sup>Sr\/<jats:sup>88<\/jats:sup>Sr isotope ratios were 6.47\u2009\u00b1\u20090.17\u2009\u00d7\u200910<jats:sup>\u22128<\/jats:sup> and 9.04\u2009\u00b1\u20090.45\u2009\u00d7\u200910<jats:sup>\u22129<\/jats:sup> in the tap water and milk powder samples, respectively. For TIMS measurement, 50\u2009mL water and 1\u2009g milk powder samples were taken for analysis. This TIMS method demonstrated an impressive accuracy (relative bias of 4.2% and \u22122.1%, respectively) and precision (relative combined uncertainty of 4.1% and 7.6%, respectively) when compared with radiometric techniques. For the first time in the history of inorganic mass-spectrometry, <jats:sup>90<\/jats:sup>Sr analysis using a TIMS instrument is confirmed by an independent proficiency test.<\/jats:p>","DOI":"10.1038\/s41598-019-52890-3","type":"journal-article","created":{"date-parts":[[2019,11,11]],"date-time":"2019-11-11T11:03:16Z","timestamp":1573470196000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":20,"title":["Accurate and precise determination of 90Sr at femtogram level in IAEA proficiency test using Thermal Ionization Mass Spectrometry"],"prefix":"10.1038","volume":"9","author":[{"given":"Norbert","family":"Kavasi","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-7226-5193","authenticated-orcid":false,"given":"Sarata Kumar","family":"Sahoo","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Hideki","family":"Arae","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Tatsuo","family":"Aono","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Zenon","family":"Palacz","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"297","published-online":{"date-parts":[[2019,11,11]]},"reference":[{"key":"52890_CR1","doi-asserted-by":"publisher","first-page":"105","DOI":"10.1016\/j.aca.2007.12.012","volume":"608","author":"X Hou","year":"2008","unstructured":"Hou, X. & Roos, P. 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