Nuclide reference
Pu-239 — Plutonium-239
The half-life of Pu-239 is 24,110 years. Main decay mode: α decay to U-235m (99.95%).
Identification
- Element
- Plutonium (Pu)
- Atomic number Z
- 94
- Mass number A
- 239
- State
- Radioactive
Key quantities
- Half-life
- 24,110 years
- Specific activity
- 2.295e+9 Bq/g
- Gamma constant Γ
- —
- A1 / A2 for transport (SSR-6, НП-053-16)
- 10 TBq / 0.001 TBq
- D-value (НП-067-24)
- 0.06 TBq
Decay modes
Main gamma lines
| Energy, keV | Yield, % |
|---|---|
| 13.6082 · X-ray line | 1.476 |
| 3.27185 · X-ray line | 0.5253 |
| 12.975 | 0.03695 |
| 51.624 | 0.02722 |
| 38.661 | 0.01044 |
| 129.296 | 0.00631 |
| 375.054 | 0.001554 |
| 413.713 | 0.001466 |
| 98.78 | 0.001465 |
| 56.828 | 0.001152 |
Lines of the bare nuclide (ENDF/B-VIII.0), without daughter ingrowth.
Alpha and beta particles
| Radiation | Energy, keV | Yield, % |
|---|---|---|
| α | 5,156.6 | 70.77 |
| 5,144.3 | 17.11 | |
| 5,105.5 | 11.94 | |
| 5,076 | 0.078 |
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.