Nuclide reference
Hf-182 — Hafnium-182
The half-life of Hf-182 is 8.9 million years. Main decay mode: β⁻ decay to Ta-182 (100%).
Identification
- Element
- Hafnium (Hf)
- Atomic number Z
- 72
- Mass number A
- 182
- State
- Radioactive
Key quantities
- Half-life
- 8.9 million years
- Specific activity
- 8,166,000 Bq/g
- Gamma constant Γ
- —
- A1 / A2 for transport (SSR-6, НП-053-16)
- unlimited / unlimited
- D-value (НП-067-24)
- 0.05 TBq
Decay modes
- β⁻ decay → Ta-182 — 100 %
Main gamma lines
| Energy, keV | Yield, % |
|---|---|
| 270.408 | 79 |
| 67.7497 (Ta-182) | 42.92 |
| 1,121.29 (Ta-182) | 35.24 |
| 1,221.4 (Ta-182) | 27.23 |
| 59.319 (Ta-182) · X-ray line | 17.75 |
| 1,189.04 (Ta-182) | 16.49 |
| 100.106 (Ta-182) | 14.2 |
| 1,231 (Ta-182) | 11.62 |
| 8.38338 (Ta-182) · X-ray line | 11.4 |
| 222.109 (Ta-182) | 7.566 |
Includes daughter nuclides in equilibrium: Ta-182 (yield per decay of Hf-182); the emitting nuclide is in brackets. Equilibrium is reached in about 2.2 years.
Alpha and beta particles
| Radiation | Energy, keV | Yield, % |
|---|---|---|
| β⁻, E max | 104.59 | 100 |
| 524.85 (Ta-182) | 43.2 | |
| 260.78 (Ta-182) | 29.23 | |
| 440.17 (Ta-182) | 20.1 |
For β⁻ the endpoint (maximum) energy of the spectrum is given. ENDF/B-VIII.0.
Related calculators
Reference data vs computed valuesHalf-life, gamma lines and D-value are reference data (ENDF/B-VIII.0, НП-067-24).Gamma constant Γ is H*(10) at 1 m computed from ICRP-107 spectra (NIST µ_en/ρ, ICRP-74 Table A.21) including short-lived progeny in equilibrium (e.g. Cs-137/Ba-137m, Ra-226 series); specific activity uses molar mass M ≈ mass number A.K-series X-ray energies are from NIST SRD 128 (Deslattes et al., 2003): in ENDF/B-VIII.0 they are given to 1 % and shifted by up to 0.7 keV for heavy elements. L-series lines and all yields are ENDF/B-VIII.0.