Olga Pravdivtseva, Alex Meshik, Charles M Hohenberg
{"title":"Evaluation of the <sup>129</sup>I Half-Life Value Through Analyses of Primitive Meteorites.","authors":"Olga Pravdivtseva, Alex Meshik, Charles M Hohenberg","doi":"10.7566/JPSCP.14.011005","DOIUrl":null,"url":null,"abstract":"<p><p>The preserved record of decay of now-extinct <sup>129</sup>I into <sup>129</sup>Xe forms the basis of the I-Xe chronometer. Comparison of the high precision I-Xe and Pb-Pb ages of chondrules and pure mineral phases separated from eight meteorites suggests the 17.5 ÷ 14.6 Ma range for the <sup>129</sup>I half-life, assuming that the <sup>235</sup>U and <sup>238</sup>U half-lives are correct. The mean value of 16 Ma indicates that the 15.7 Ma half-life of <sup>129</sup>I used here for the I-Xe age calculations is most probably correct. Since the <sup>129</sup>I half-life value only affects the relative I-Xe ages, the few Ma relative to the Shallowater standard, the absolute I-Xe ages are almost immune to this uncertainty in the <sup>129</sup>I half-life.</p>","PeriodicalId":92090,"journal":{"name":"JPS conference proceedings","volume":null,"pages":null},"PeriodicalIF":0.0000,"publicationDate":"2017-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.7566/JPSCP.14.011005","citationCount":"1","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"JPS conference proceedings","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/10.7566/JPSCP.14.011005","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"2016/8/10 0:00:00","PubModel":"Epub","JCR":"","JCRName":"","Score":null,"Total":0}
引用次数: 1
Abstract
The preserved record of decay of now-extinct 129I into 129Xe forms the basis of the I-Xe chronometer. Comparison of the high precision I-Xe and Pb-Pb ages of chondrules and pure mineral phases separated from eight meteorites suggests the 17.5 ÷ 14.6 Ma range for the 129I half-life, assuming that the 235U and 238U half-lives are correct. The mean value of 16 Ma indicates that the 15.7 Ma half-life of 129I used here for the I-Xe age calculations is most probably correct. Since the 129I half-life value only affects the relative I-Xe ages, the few Ma relative to the Shallowater standard, the absolute I-Xe ages are almost immune to this uncertainty in the 129I half-life.