Nuclide reference
Bi-212 — Bismuth-212
The half-life of Bi-212 is 1.0092 h. Main decay mode: β⁻ decay to Po-212 (64.06%).
Identification
- Element
- Bismuth (Bi)
- Atomic number Z
- 83
- Mass number A
- 212
- State
- Radioactive
Key quantities
- Half-life
- 1.0092 h
- Specific activity
- 5.42e+17 Bq/g
- Gamma constant Γ
- —
- A1 / A2 for transport (SSR-6, НП-053-16)
- 0.7 TBq / 0.6 TBq
- D-value (НП-067-24)
- 0.05 TBq
Decay modes
Main gamma lines
| Energy, keV | Yield, % |
|---|---|
| 2,614.51 (Tl-208) | 37.76 |
| 583.187 (Tl-208) | 32.17 |
| 510.77 (Tl-208) | 8.554 |
| 727.33 | 6.669 |
| 860.557 (Tl-208) | 4.731 |
| 10.256 · X-ray line | 3.742 |
| 12.229 · X-ray line | 2.874 |
| 277.371 (Tl-208) | 2.498 |
| 1,620.5 | 1.467 |
| 785.37 | 1.102 |
Includes daughter nuclides in equilibrium: Po-212, Tl-208 (yield per decay of Bi-212); the emitting nuclide is in brackets. Equilibrium is reached in about 23 min.
Alpha and beta particles
| Radiation | Energy, keV | Yield, % |
|---|---|---|
| α | 6,050.8 | 25.13 |
| 6,089.9 | 9.747 | |
| 5,768 | 0.611 | |
| 8,784.9 (Po-212) | 64.06 | |
| β⁻, E max | 2,252.1 | 55.37 |
| 1,801.3 (Tl-208) | 18.58 | |
| 1,290.6 (Tl-208) | 9.159 | |
| 1,523.9 (Tl-208) | 8.402 |
For β⁻ the endpoint (maximum) energy of the spectrum is given. ENDF/B-VIII.0.
Related calculators
Other isotopes of this element
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.