Tc
Technetium
Z = 43 · Transition Metal · 97.0 u
Nuclear Engineering Significance
All isotopes are radioactive. Tc-99 (t₁/₂ = 211,000 y) is a major long-lived fission product and a key concern in spent fuel disposal due to its mobility in groundwater. Tc-99m (metastable, t₁/₂ = 6 h) is the most widely used medical imaging isotope.
Basic properties
- Atomic number (Z)
- 43
- Standard atomic mass
- 97.0 u
- Category
- Transition Metal
Isotopes & cross-section data
| Isotope | Mass (A) | Half-life | ZAID | Libraries |
|---|---|---|---|---|
| Tc-99 | 99 | 2.111e5 y | .80c.71c |