Nuclide reference
Np-239 — Neptunium-239
Np-239 की half-life 2.356 d है। मुख्य decay mode: β⁻ decay → Pu-239 (100%)।
Identification
- तत्व
- Neptunium (Np)
- Atomic number Z
- 93
- Mass number A
- 239
- State
- Radioactive
Key quantities
- Half-life
- 2.356 d
- विशिष्ट गतिविधि
- 8.58e+15 Bq/g
- Gamma constant Γ
- —
- परिवहन के लिए A1 / A2 (SSR-6)
- 7 TBq / 0.4 TBq
- D-value (НП-067-24)
- 0.5 TBq
Decay modes
- β⁻ decay → Pu-239 — 100 %
Main gamma lines
| Energy, keV | Yield, % |
|---|---|
| 106.123 | 26.3 |
| 14.2745 · X-ray line | 22.33 |
| 103.735 · X-ray line | 21.58 |
| 277.599 | 14.44 |
| 228.183 | 11.14 |
| 209.753 | 3.42 |
| 4.2 | 2.7 |
| 334.31 | 2.06 |
| 315.88 | 1.6 |
| 61.46 | 1.3 |
Lines of the bare nuclide (ENDF/B-VIII.0), without daughter ingrowth.
Alpha and beta particles
| Radiation | Energy, keV | Yield, % |
|---|---|---|
| β⁻, E max | 436.34 | 45 |
| 330.21 | 42 | |
| 391.68 | 7 | |
| 713.94 | 2 |
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.