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- W658640507 abstract "Analyses of the content and isotopic composition of xenon and krypton in terrestiral ores containing tellurium, selenium or iodine res ulted in the following conclusions: 1. The double beta-decay half-life for 130Te is 2.51 x 1021 years from analysis of tellurobismuthite from Boliden, Sweden and 2.83 x 1021 years from analysis of tellurides from Kalgoorlie, Australia. 2. The ratio of the double beta-decay half-life of 128Te relative to that of 130Te is > 108 and> 293 for Boliden tellurobismuthite and Kalgoorlie tellurides, respecti vely. 3. Selenium minerals and tellurium ores containing selenium exhibit 82Kr excess attributed to the double beta-decay of 82se. Preliminary half -life value for this decay is (2-4)1020 years. 4. The formation of excesses of 129xe and 13lxe in tellurium ores and excess 83Kr in selenium ores result from nuclear reactions on tellurium and selenium, respectively. 5. The excess 129xe in iodyrite (silver iodide) is from the in situ decay of 129r incorporated in the ore during its formation. From the observed isotopic composition of xenon, it is calculated that prior to the nuclear age, the equilibrium ratio of 129r;l27r was between 2.2 x 10-15 and 3.3 x 10-15. 6. Measurements of the 130xe, formed from the decay of 13 OTe, and the tellurium content allow the age determination of hydrothermal deposits of tellurium by the 130Te-130xe dating method. The ages of three telluride samples obtained by this new dating technique agree with geologic age estimates. lV Application of the neutron irradiation method of 129r_l29xe dating to chondrules and matrix of Bjurbole meteorite reveal the following: 1. The 129r jl2 7 ratios incorporated in the Bj urbole chondrules and matrix are identical thereby indicating that these fractions are contemporaneous within ± 1. 5 x 106 years. 2. The method of 129r_l29xe age determination by the neutron irradiation method is dependent on the intensity of the neutron flux. The release pattern of iodinecorrelated 129xe is altered for all extraction temperatures by the use of high neutron flux. The relative fission yields from the spontaneous fission of 252cf for krypton and xenon isotopes are 83Kr :84Kr :85Kr :86Kr )3l:Xe )32Xe: 134xe)36xe = 0.010:0.017:0 0049:0.032:0.35:0.52:0.92::1.000. A comparison of these results with the spontaneous fission yields of other actinides suggests that the enrichment observed in the heavy xenon isotopes" @default.
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- W658640507 date "1971-01-01" @default.
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- W658640507 title "Noble gases anomalies in terrestrial ores and meteorites" @default.
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