Nuclide reference
Po-218 — Polonium-218
The half-life of Po-218 is 3.098 min. Main decay mode: α decay to Pb-214 (99.98%).
Identification
- Element
- Polonium (Po)
- Atomic number Z
- 84
- Mass number A
- 218
- State
- Radioactive
Key quantities
- Half-life
- 3.098 min
- Specific activity
- 1.03e+19 Bq/g
- Gamma constant Γ
- —
- D-value (НП-067-24)
- —
Decay modes
Main gamma lines
| Energy, keV | Yield, % |
|---|---|
| 62.69 (At-218) | 0.01813 |
| 836 | 0.00109 |
Includes daughter nuclides in equilibrium: At-218 (yield per decay of Po-218); the emitting nuclide is in brackets. Equilibrium is reached in about 11 s.
Alpha and beta particles
| Radiation | Energy, keV | Yield, % |
|---|---|---|
| α | 6,002.3 | 99.98 |
| 6,693 (At-218) | 0.01813 | |
| β⁻, E max | 260 | 0.02 |
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.