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Isotopes of thallium
・ Isotopes of thorium
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Isotopes of thallium : ウィキペディア英語版
Isotopes of thallium
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 ==



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