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99Tc and 129I are important contributors to risk assessment due to their long half-lives and high mobility as aqueous anionic species. We analyzed 99Tc and 129I in groundwater samples in and near 11 underground nuclear tests and in melt glass and rock samples retrieved from the Chancellor test cavity, Nevada Test Site. The 129I/127I ratio ranges from 10−3 to 10−6 in cavity water and 10−4 to 10−9...
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