Tellurium-121 is a radioisotope of the chemical element tellurium which, in addition to the element-specific 52 protons, has 69 neutrons in the atomic nucleus, resulting in the mass number 121. The very short-lived, only artificially producible, unstable and therefore radioactive nuclide has no practical significance; dealing with 121Te is for academic purposes only.
The isotope is one of the few atomic nuclei in which some metastable nuclear isomers have longer half-lives.
See also: list of Tellurium isotopes.
Half-life T½ = 19.17(4) d respectively 1.656288 × 106 seconds s.
Decay mode | Daughter | Probability | Decay energy | γ energy (intensity) |
---|---|---|---|---|
EC/β+ | 121Sb | 100 % | 1.056(26) MeV | 0.573139(11) MeV 80.4(22) % |
Direct parent isotope is: 121I.
Nuclear isomers or excited states with the activation energy in keV related to the ground state.
Nuclear Isomer | Excitation Energy | Half-life | Spin |
---|---|---|---|
121mTe | 293.974(22) keV | 164.2(8) d | 11/2- |
Z | Isotone N = 69 | Isobar A = 121 |
---|---|---|
38 | 107Sr | |
39 | 108Y | |
40 | 109Zr | |
41 | 110Nb | |
42 | 111Mo | |
43 | 112Tc | 121Tc |
44 | 113Ru | 121Ru |
45 | 114Rh | 121Rh |
46 | 115Pd | 121Pd |
47 | 116Ag | 121Ag |
48 | 117Cd | 121Cd |
49 | 118In | 121In |
50 | 119Sn | 121Sn |
51 | 120Sb | 121Sb |
52 | 121Te | 121Te |
53 | 122I | 121I |
54 | 123Xe | 121Xe |
55 | 124Cs | 121Cs |
56 | 125Ba | 121Ba |
57 | 126La | 121La |
58 | 127Ce | 121Ce |
59 | 128Pr | 121Pr |
60 | 129Nd | |
61 | 130Pm | |
62 | 131Sm | |
63 | 132Eu |
Last update: 2023-05-22
Perma link: https://www.chemlin.org/isotope/tellurium-121
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