Nuclide reference
Bi-207 — Bismuth-207
The half-life of Bi-207 is 31.55 years. Main decay mode: β⁺ decay / electron capture to Pb-207 (100%).
Identification
- Element
- Bismuth (Bi)
- Atomic number Z
- 83
- Mass number A
- 207
- State
- Radioactive
Key quantities
- Half-life
- 31.55 years
- Specific activity
- 2.025e+12 Bq/g
- Gamma constant Γ (H*(10))
- 0.236 µSv·m²/(MBq·h)
- Dose rate, 1 GBq at 1 m
- ≈ 236 µSv/h
- A1 / A2 for transport (SSR-6, НП-053-16)
- 0.7 TBq / 0.7 TBq
- D-value (НП-067-24)
- 0.05 TBq
Decay modes
- β⁺ decay / electron capture → Pb-207 — 100 %
Main gamma lines
| Energy, keV | Yield, % |
|---|---|
| 569.698 | 97.75 |
| 1,063.66 | 74.5 |
| 74.97 · X-ray line | 36.75 |
| 72.807 · X-ray line | 21.73 |
| 1,770.23 | 6.87 |
| 1,442.2 | 0.131 |
| 897.77 | 0.128 |
| 510.999 · annihilation 511 keV | 0.076 |
| 328.1 | 0.00069 |
Lines of the bare nuclide (ENDF/B-VIII.0), without daughter ingrowth.
Alpha and beta particles
| Radiation | Energy, keV | Yield, % |
|---|---|---|
| β⁺, E max | 805.8 | 0.038 |
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.Dose rate example: point source, no shielding or scatter, Ḣ = Γ·A/r².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.