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Thallium (Tl) has 37 isotopes with atomic masses that range from 176 to 212. 203Tl and 205Tl are the only stable isotopes and 204Tl is the most stable radioisotope with a half-life of 3.78 years. 207Tl, with a half-life of 4.77 minutes, has the longest half-life of naturally occurring radioisotopes. Thallium-202 (half-life 12.23 days) can be made in a cyclotron〔(Thallium Research ) from Department of Energy〕 while thallium-204 (half-life 3.78 years) is made by the neutron activation of stable thallium in a nuclear reactor.〔(Manual for reactor produced radioisotopes ) from the International Atomic Energy Agency〕 In fully ionized state, the isotope 205Tl becomes beta-radioactive, decaying to 205Pb.〔http://www.ca.infn.it/~oldeman/resneu/p1522_1.pdf〕 It means that in fully ionized state thallium has only one stable isotope, 203Tl. Standard atomic mass: 204.3833(2) u. == Table == 〔 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Isotopes of thallium」の詳細全文を読む スポンサード リンク
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