Nuclide reference
Np-237 — Neptunium-237
Np-237 की half-life 2.144 million years है। मुख्य decay mode: α decay → Pa-233 (100%)।
Identification
- तत्व
- Neptunium (Np)
- Atomic number Z
- 93
- Mass number A
- 237
- State
- Radioactive
Key quantities
- Half-life
- 2.144 million years
- विशिष्ट गतिविधि
- 26,030,000 Bq/g
- Gamma constant Γ
- —
- परिवहन के लिए A1 / A2 (SSR-6)
- 20 TBq / 0.002 TBq
- D-value (НП-067-24)
- 0.07 TBq
Decay modes
- α decay → Pa-233 — 100 %
Main gamma lines
| Energy, keV | Yield, % |
|---|---|
| 13.6 (Pa-233) · X-ray line | 43 |
| 311.904 (Pa-233) | 38.5 |
| 16.6005 · X-ray line | 19.77 |
| 29.374 | 14.12 |
| 86.477 | 12.44 |
| 8.22 | 9 |
| 300.129 (Pa-233) | 6.63 |
| 340.476 (Pa-233) | 4.45 |
| 86.595 (Pa-233) | 1.95 |
| 415.764 (Pa-233) | 1.733 |
Includes daughter nuclides in equilibrium: Pa-233 (yield per decay of Np-237); the emitting nuclide is in brackets. Equilibrium is reached in about 190 d.
Alpha and beta particles
| Radiation | Energy, keV | Yield, % |
|---|---|---|
| α | 4,788 | 47.64 |
| 4,771.4 | 23.2 | |
| 4,766.5 | 9.3 | |
| 4,640 | 6.43 | |
| β⁻, E max | 154.34 (Pa-233) | 26.7 |
| 229.62 (Pa-233) | 26 | |
| 258.2 (Pa-233) | 24 | |
| 171.61 (Pa-233) | 16.2 |
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.