Nuclide reference
Bi-215 — Bismuth-215
The half-life of Bi-215 is 7.7 min. Main decay mode: β⁻ decay to Po-215 (100%).
Identification
- Element
- Bismuth (Bi)
- Atomic number Z
- 83
- Mass number A
- 215
- State
- Radioactive
Key quantities
- Half-life
- 7.7 min
- Specific activity
- 4.202e+18 Bq/g
- Gamma constant Γ
- —
- D-value (НП-067-24)
- —
Decay modes
- β⁻ decay → Po-215 — 100 %
Main gamma lines
| Energy, keV | Yield, % |
|---|---|
| 293.74 | 31.7 |
| 271.7 | 1.743 |
| 517.6 | 0.6023 |
| 835.2 | 0.4438 |
| 564.1 | 0.4121 |
| 402.4 | 0.317 |
| 676.5 | 0.1902 |
| 438.9 (Po-215) | 0.06 |
Includes daughter nuclides in equilibrium: Po-215 (yield per decay of Bi-215); the emitting nuclide is in brackets. Equilibrium is reached in about 0.012 s.
Alpha and beta particles
| Radiation | Energy, keV | Yield, % |
|---|---|---|
| α | 7,386.1 (Po-215) | 99.94 |
| 6,954 (Po-215) | 0.06 | |
| 6,950.1 (Po-215) | 0.022 | |
| β⁻, E max | 2,189 | 65 |
| 1,895.3 | 31.7 | |
| 1,917.3 | 1.33 | |
| 1,353.5 | 0.86 |
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.