Nuclide reference
Bi-205 — Bismuth-205
The half-life of Bi-205 is 15.31 d. Main decay mode: β⁺ decay / electron capture to Pb-205 (100%).
Identification
- Element
- Bismuth (Bi)
- Atomic number Z
- 83
- Mass number A
- 205
- State
- Radioactive
Key quantities
- Half-life
- 15.31 d
- Specific activity
- 1.539e+15 Bq/g
- Gamma constant Γ
- —
- A1 / A2 for transport (SSR-6, НП-053-16)
- 0.7 TBq / 0.7 TBq
- D-value (НП-067-24)
- 0.04 TBq
Decay modes
- β⁺ decay / electron capture → Pb-205 — 100 %
Main gamma lines
| Energy, keV | Yield, % |
|---|---|
| 74.97 · X-ray line | 36.88 |
| 1,764.3 | 32.47 |
| 703.45 | 31.1 |
| 72.807 · X-ray line | 21.81 |
| 987.66 | 16.13 |
| 1,043.75 | 7.511 |
| 1,861.7 | 6.17 |
| 579.8 | 5.443 |
| 570.6 | 4.335 |
| 1,775.8 | 3.987 |
Lines of the bare nuclide (ENDF/B-VIII.0), without daughter ingrowth.
Alpha and beta particles
| Radiation | Energy, keV | Yield, % |
|---|---|---|
| β⁺, E max | 980.56 | 0.141 |
| 1,684 | 0.055 |
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.