Nuclide reference
Bi-211 — Bismuth-211
The half-life of Bi-211 is 2.14 min. Main decay mode: α decay to Tl-207 (99.72%).
Identification
- Element
- Bismuth (Bi)
- Atomic number Z
- 83
- Mass number A
- 211
- State
- Radioactive
Key quantities
- Half-life
- 2.14 min
- Specific activity
- 1.541e+19 Bq/g
- Gamma constant Γ
- —
- D-value (НП-067-24)
- —
Decay modes
Main gamma lines
| Energy, keV | Yield, % |
|---|---|
| 351.07 | 13.02 |
| 72.874 · X-ray line | 1.227 |
| 70.833 · X-ray line | 0.7275 |
Lines of the nuclide itself (ENDF/B-VIII.0).
Alpha and beta particles
| Radiation | Energy, keV | Yield, % |
|---|---|---|
| α | 6,622.9 | 83.54 |
| 6,278.2 | 16.19 | |
| 7,450.3 (Po-211) | 0.2741 | |
| β⁻, E max | 574 | 0.276 |
For β⁻ the endpoint (maximum) energy of the spectrum is given. ENDF/B-VIII.0. Includes daughter nuclides in equilibrium: Po-211 (yield per decay of Bi-211); the emitting nuclide is in brackets. Equilibrium is reached in about 3.6 s.
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.