Nuclide reference
Pu-244 — Plutonium-244
Pu-244 की half-life 81.1 million years है। मुख्य decay mode: α decay → U-240 (99.88%)।
Identification
- तत्व
- Plutonium (Pu)
- Atomic number Z
- 94
- Mass number A
- 244
- State
- Radioactive
Key quantities
- Half-life
- 81.1 million years
- विशिष्ट गतिविधि
- 668,400 Bq/g
- Gamma constant Γ
- —
- परिवहन के लिए A1 / A2 (SSR-6)
- 0.4 TBq / 0.001 TBq
- D-value (НП-067-24)
- 0.0003 TBq
Decay modes
- α decay → U-240 — 99.88 %
- spontaneous fission — 0.125 %
Main gamma lines
| Energy, keV | Yield, % |
|---|---|
| 554.6 (Np-240m) | 20.85 |
| 18.1431 (Np-240m) · X-ray line | 13.29 |
| 14.2742 (Np-240m) · X-ray line | 11.93 |
| 597.4 (Np-240m) | 11.67 |
| 1,496.9 (Np-240m) | 1.327 |
| 817.89 (Np-240m) | 1.277 |
| 938.02 (Np-240m) | 1.207 |
| 758.61 (Np-240m) | 1.177 |
| 263.37 (Np-240m) | 1.137 |
| 44.1 (U-240) | 1.049 |
Includes daughter nuclides in equilibrium: U-240, Np-240m (yield per decay of Pu-244); the emitting nuclide is in brackets. Equilibrium is reached in about 4.1 d.
Alpha and beta particles
| Radiation | Energy, keV | Yield, % |
|---|---|---|
| α | 4,589 | 80.5 |
| 4,546 | 19.38 | |
| β⁻, E max | 380 (U-240) | 74.91 |
| 335.83 (U-240) | 24.97 | |
| 2,165.2 (Np-240m) | 41.9 | |
| 1,610.6 (Np-240m) | 30.92 |
For β⁻ the endpoint (maximum) energy of the spectrum is given. ENDF/B-VIII.0.
Related calculators
इसी element के अन्य isotopes
Reference data vs computed valuesHalf-life, gamma lines and D-value are reference data (ENDF/B-VIII.0, НП-067-24).Gamma constant Γ 1 m पर H*(10) है, ICRP-107 spectra (NIST µ_en/ρ, ICRP-74 Table A.21) से गणना की गई, equilibrium में short-lived progeny सहित (जैसे Cs-137/Ba-137m, Ra-226 series); specific activity molar mass M ≈ mass number A का उपयोग करती है।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.