Isotopic Anomalies of Xenon from Tellurium minerals

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Xenon extracted from old tellurium minerals were analyzed with a high-sensitivity mass spectrometer. Old tellurium minerals of different four localities were used in the experiments, that is, tetradymite(Bi2 Te2S)from the Oya mine, tellurobismuthite(Bi2 Te3)from the Suwa mine, tellurium mineral(AgAuTe+Te)from the Rendai-ji mine and native tellurium(Te)from the Teine mine. In heating the sample minerals, the temperature was raised stepwise typically by100°C and kept constant for a hour. Rare gases extracted at step of extraction temperature were purified and then sealed up in the respective ampoul. Large excesses in129Xe, 130Xe and131Xe extracted from the Oya tellurium mineral and in130Xe from the Suwa tellurium mineral were found definitely. Their origins were discussed on the basis of the isotopic amonalies patterns as well as experimental and theoretical considerations on the nuclear reaction relating to the relevant isotopis of xenon. The130Xe-excess was attributed to doubleβ-decay of130Te. A mall excess in128Xe was interested in relation to double β-decay of128Te. Several nuclear processes which could contribute to128Xe were discussed on the available data. Concerning the isotopic amonalies in129Xe and131Xe, the ratio 129Xe-excess/130Xe-excess(m=129 and 131)seems to decrease and the ratio129Xe-excess/131Xe-excess seems to increase with the increasing tellurium concentration for the Oya tellurium minerals. We may be able to look for a solution of the amonalies in either the epithermal neutron captures on128Te and on130Te or both the(μ-, n)reaction of130Te and the themal neutron captures on128Te and on130Te, where the neutrons can be produced by the(μ-, n)reactions and the(α, n)recations on the environmental rocks. In order to understand the above results on the ratio between Xe-excess, we may have to take into account the competition process between between the neutron captures on128Te and on130Te and the neutron adsorptions by the associated impurities, and the(a, n)reactions on126Te and on128Te respectively.
日本質量分析学会の論文

Isotopic Anomalies of Xenon from Tellurium minerals

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