Nuclide reference
U-238 — Uranium-238
U-238 की half-life 4.468 billion years है। मुख्य decay mode: α decay → Th-234 (100%)।
Identification
- तत्व
- Uranium (U)
- Atomic number Z
- 92
- Mass number A
- 238
- State
- Radioactive
Key quantities
- Half-life
- 4.468 billion years
- विशिष्ट गतिविधि
- 12,440 Bq/g
- Gamma constant Γ
- —
- परिवहन के लिए A1 / A2 (SSR-6)
- असीमित / असीमित
- D-value (НП-067-24)
- —
Decay modes
- α decay → Th-234 — 100 %
- spontaneous fission — 0.0000546 %
Main gamma lines
| Energy, keV | Yield, % |
|---|---|
| 13.3 (Th-234) · X-ray line | 7.04 |
| 16.1501 · X-ray line | 3.707 |
| 63.29 (Th-234) | 3.665 |
| 92.38 (Th-234) | 2.13 |
| 92.8 (Th-234) | 2.1 |
| 1,001.03 (Pa-234m) | 0.8417 |
| 766.42 (Pa-234m) | 0.3173 |
| 112.81 (Th-234) | 0.21 |
| 742.813 (Pa-234m) | 0.1066 |
| 258.227 (Pa-234m) | 0.07642 |
Includes daughter nuclides in equilibrium: Th-234, Pa-234m (yield per decay of U-238); the emitting nuclide is in brackets. Equilibrium is reached in about 170 d.
Alpha and beta particles
| Radiation | Energy, keV | Yield, % |
|---|---|---|
| α | 4,198 | 79 |
| 4,151 | 20.9 | |
| 4,038 | 0.078 | |
| β⁻, E max | 199.08 (Th-234) | 78 |
| 106.7 (Th-234) | 14 | |
| 106.28 (Th-234) | 6.4 | |
| 2,273.9 (Pa-234m) | 97.57 |
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.