Nuclide reference
Pb-211 — Lead-211
The half-life of Pb-211 is 36.1 min. Main decay mode: β⁻ decay to Bi-211 (100%).
Identification
- Element
- Lead (Pb)
- Atomic number Z
- 82
- Mass number A
- 211
- State
- Radioactive
Key quantities
- Half-life
- 36.1 min
- Specific activity
- 9.133e+17 Bq/g
- Gamma constant Γ
- —
- D-value (НП-067-24)
- —
Decay modes
- β⁻ decay → Bi-211 — 100 %
Main gamma lines
| Energy, keV | Yield, % |
|---|---|
| 351.07 (Bi-211) | 13.84 |
| 404.853 | 3.783 |
| 832.01 | 3.524 |
| 427.088 | 1.756 |
| 72.874 (Bi-211) · X-ray line | 1.305 |
| 70.833 (Bi-211) · X-ray line | 0.7733 |
| 766.51 | 0.6171 |
| 704.64 | 0.4622 |
| 897.77 (Tl-207) | 0.3212 |
| 1,109.48 | 0.1149 |
Includes daughter nuclides in equilibrium: Bi-211, Po-211, Tl-207 (yield per decay of Pb-211); the emitting nuclide is in brackets. Equilibrium is reached in about 38 min. In transient equilibrium a daughter's activity exceeds the parent's, so a yield can be above 100%.
Alpha and beta particles
| Radiation | Energy, keV | Yield, % |
|---|---|---|
| α | 6,622.9 (Bi-211) | 88.8 |
| 6,278.2 (Bi-211) | 17.21 | |
| 7,450.3 (Po-211) | 0.2903 | |
| β⁻, E max | 1,367 | 91.3 |
| 535.05 | 6.32 | |
| 962.15 | 1.54 | |
| 1,418 (Tl-207) | 121.8 |
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.