Nuclide reference
Pb-201 — Lead-201
The half-life of Pb-201 is 9.33 h. Main decay mode: β⁺ decay / electron capture to Tl-201 (100%).
Identification
- Element
- Lead (Pb)
- Atomic number Z
- 82
- Mass number A
- 201
- State
- Radioactive
Key quantities
- Half-life
- 9.33 h
- Specific activity
- 6.183e+16 Bq/g
- Gamma constant Γ
- —
- A1 / A2 for transport (SSR-6, НП-053-16)
- 1 TBq / 1 TBq
- D-value (НП-067-24)
- 0.09 TBq
Decay modes
- β⁺ decay / electron capture → Tl-201 — 100 %
Main gamma lines
| Energy, keV | Yield, % |
|---|---|
| 331.15 | 76.9 |
| 72.874 · X-ray line | 43.8 |
| 70.833 · X-ray line | 25.84 |
| 361.25 | 9.464 |
| 945.96 | 7.166 |
| 907.67 | 6.118 |
| 692.41 | 4.293 |
| 584.6 | 3.566 |
| 767.26 | 3.279 |
| 826.26 | 2.383 |
Lines of the bare nuclide (ENDF/B-VIII.0), without daughter ingrowth.
Alpha and beta particles
| Radiation | Energy, keV | Yield, % |
|---|---|---|
| β⁺, E max | 566.83 | 0.061 |
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.