Nuclide reference
Pb-205 — Lead-205
The half-life of Pb-205 is 17.3 million years. Main decay mode: electron capture to Tl-205 (100%).
Identification
- Element
- Lead (Pb)
- Atomic number Z
- 82
- Mass number A
- 205
- State
- Radioactive
Key quantities
- Half-life
- 17.3 million years
- Specific activity
- 3,730,000 Bq/g
- Gamma constant Γ
- —
- A1 / A2 for transport (SSR-6, НП-053-16)
- unlimited / unlimited
- D-value (НП-067-24)
- —
Decay modes
- electron capture → Tl-205 — 100 %
Main gamma lines
| Energy, keV | Yield, % |
|---|---|
| 10.256 · X-ray line | 10.88 |
| 12.2267 · X-ray line | 8.649 |
| 2.31136 · X-ray line | 5.12 |
| 14.6316 · X-ray line | 1.768 |
| 9.17666 · X-ray line | 1.008 |
Lines of the bare nuclide (ENDF/B-VIII.0), without daughter ingrowth.
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.