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There are 39 known isotopes and 17 nuclear isomers of tellurium (52 Te), with atomic masses that range from 104 to 142. These are listed in the table below. Naturally-occurring tellurium on Earth consists of eight isotopes. Two of these have been found to be radioactive: 128 Te and 130 Te undergo double beta decay with half-lives of, respectively, 2.2×10 24 (2.2 septillion) years (the longest ...
In nuclear science a decay chain refers to the predictable series of radioactive disintegrations undergone by the nuclei of certain ... tellurium-128 has a half-life ...
Decay; abundance half-life (t 1/2) ... Tellurium is a chemical element; ... Crystalline tellurium consists of parallel helical chains of Te atoms, with three atoms ...
The palladium forms an alloy with the fission tellurium. This alloy can separate from the glass. 107 Pd is the only long-living radioactive isotope among the fission products and its beta decay has a long half life and low energy, this allows industrial use of extracted palladium without isotope separation. [9]
However, the heaviest naturally occurring tellurium nuclide, 130 Te (34% of natural tellurium) absorbs a neutron to become tellurium-131, which beta decays with a half-life of 25 minutes to 131 I. A tellurium compound can be irradiated while bound as an oxide to an ion exchange column, with evolved 131 I then eluted into an alkaline solution. [12]
This is because the mass–energy is a convex function of atomic number, so all nuclides on an odd isobaric chain except one have a lower-energy neighbor to which they can decay by beta decay. See Mattauch isobar rule. (123 Te is expected to decay to 123 Sb, but the half-life appears to be so long that the decay has never been observed.)
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The electron capture produces a tellurium-125 nucleus in an excited state with a half-life of 1.6 ns, which undergoes gamma decay emitting a gamma photon or an internal conversion electron at 35.5 keV. A second electron relaxation cascade follows the gamma decay before the nuclide comes to rest.