Nuclide reference
Np-240 — Neptunium-240
Np-240 की half-life 1.0317 h है। मुख्य decay mode: β⁻ decay → Pu-240 (100%)।
Identification
- तत्व
- Neptunium (Np)
- Atomic number Z
- 93
- Mass number A
- 240
- State
- Radioactive
Key quantities
- Half-life
- 1.0317 h
- विशिष्ट गतिविधि
- 4.683e+17 Bq/g
- Gamma constant Γ
- —
- D-value (НП-067-24)
- —
Decay modes
- β⁻ decay → Pu-240 — 100 %
Main gamma lines
| Energy, keV | Yield, % |
|---|---|
| 18.1279 · X-ray line | 51.32 |
| 14.2761 · X-ray line | 46.31 |
| 566.34 | 27.6 |
| 973.9 | 25.9 |
| 600.57 | 20 |
| 895.8 | 14.8 |
| 448.01 | 13.4 |
| 867.2 | 8.8 |
| 152.7 | 7.3 |
| 987.7 | 7.3 |
Lines of the bare nuclide (ENDF/B-VIII.0), without daughter ingrowth.
Alpha and beta particles
| Radiation | Energy, keV | Yield, % |
|---|---|---|
| β⁻, E max | 879.25 | 68.73 |
| 1,010.6 | 7.83 | |
| 1,072.5 | 7.395 | |
| 1,150.5 | 4.35 |
For β⁻ the endpoint (maximum) energy of the spectrum is given. ENDF/B-VIII.0.
Related calculators
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.