The world's most reliable Stable Isotopes Supplier
| Nominal Mass |
Accurate Mass |
% Natural Abundance |
Chemical Form |
Enrichment Available % |
| 120 Te | 119.904048 (21) | 0.09 (1) | metal | 24 – 40+ |
| 122 Te | 121.903050 (3) | 2.55 (12) | metal, oxide | 91 – 93+ |
| 123 Te | 122.9042710 (22) | 0.89 (3) | metal, oxide | 69 – 99+ |
| 124 Te | 123.9028180 (18) | 4.74 (8) | metal, oxide | 90 - 92+ |
| 125 Te | 124.9044285 (25) | 7.07 (15) | metal | 85 – 92+ |
| 126 Te | 125.9033095 (25) | 18.84 (25) | metal | 96 - 98+ |
| 128 Te | 127.904463 | 31.74 | metal, oxide | 74 - 99+ |
| 130 Te | 129.906229 (5) | 34.08 (62) | metal, oxide | 99+ |
Tellurium has eight stable isotopes (Te-120 and Te-123 are usually considered stable because of their long half lives) and many of them have a medical application. Te-120 is used for the production of I-120g which has an application as a PET and Beta emitting isotope. Te-122 is used in the production of the radioisotope I-122 which is used in gamma imaging. Te-123 is used for the production of radioactive I-123 which is used in thyroid imaging. Te-124 is used for the production of both I-123 and the PET isotope I-124. Finally, Te-130 is used in the research into double Beta decay.