Nuclide reference
Pu-240 — Plutonium-240
The half-life of Pu-240 is 6,561 years. Main decay mode: α decay to U-236 (100%).
Identification
- Element
- Plutonium (Pu)
- Atomic number Z
- 94
- Mass number A
- 240
- State
- Radioactive
Key quantities
- Half-life
- 6,561 years
- Specific activity
- 8.4e+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
- α decay → U-236 — 100 %
- spontaneous fission — 0.0000057 %
Main gamma lines
| Energy, keV | Yield, % |
|---|---|
| 17.113 · X-ray line | 4.698 |
| 13.6085 · X-ray line | 4.322 |
| 45.244 | 0.0447 |
| 104.234 | 0.00714 |
| 160.308 | 0.000402 |
Lines of the bare nuclide (ENDF/B-VIII.0), without daughter ingrowth.
Alpha and beta particles
| Radiation | Energy, keV | Yield, % |
|---|---|---|
| α | 5,168.2 | 72.8 |
| 5,123.7 | 27.1 | |
| 5,021.2 | 0.084 |
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.