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This review evaluates two complementary uranium isotope systems developed in geosciences and examines their potential as biomarkers of uranium exposure and biological processing.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Recent Findings<\/jats:title>\n                    <jats:p>\n                      Advances in multi-collector ICP-MS have established \u03b4\n                      <jats:sup>238<\/jats:sup>\n                      U and uranium activity ratios or (\n                      <jats:sup>234<\/jats:sup>\n                      U\/\n                      <jats:sup>238<\/jats:sup>\n                      U) as independent isotope tracers. Experimental studies show that \u03b4\n                      <jats:sup>238<\/jats:sup>\n                      U fractionates during biological uptake, transport, and tissue retention, whereas uranium activity ratios remain largely unchanged after absorption and generally preserve environmental source signatures across groundwater, food webs, and biological systems.\n                    <\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Summary<\/jats:title>\n                    <jats:p>\n                      These complementary isotope systems provide information on both the origin of uranium exposure and its biological fate that cannot be obtained from concentration measurements alone. Although additional experimental validation and human studies are needed, existing analytical capabilities and mechanistic evidence support evaluating two uranium isotope tracers, \u03b4\n                      <jats:sup>238<\/jats:sup>\n                      U and the activity ratio, as novel biomarkers of uranium exposure and biotransformation.\n                    <\/jats:p>\n                  <\/jats:sec>","DOI":"10.1007\/s40572-026-00564-4","type":"journal-article","created":{"date-parts":[[2026,10,8]],"date-time":"2026-10-08T08:02:25Z","timestamp":1791446545000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Uranium Isotopes: From Geosciences to Biomedical Sciences"],"prefix":"10.1007","volume":"13","author":[{"given":"Anirban","family":"Basu","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Arijeet","family":"Mitra","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Catherine M.","family":"Lucey","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Maia","family":"Kelly","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Ana","family":"Navas-Acien","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Kathrin","family":"Schilling","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"297","published-online":{"date-parts":[[2026,10,8]]},"reference":[{"key":"564_CR1","doi-asserted-by":"publisher","unstructured":"Composition of the continental crust. 2003;1\u201364. https:\/\/doi.org\/10.1016\/B0-08-043751-6\/03016-4.","DOI":"10.1016\/B0-08-043751-6\/03016-4"},{"key":"564_CR2","doi-asserted-by":"publisher","first-page":"83","DOI":"10.17704\/eshi.8.1.a65n221521602774","volume":"8","author":"WO Kupsch","year":"1989","unstructured":"Kupsch WO, Strnad J. 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