Nuclide reference
Pa-231 — Protactinium-231
Pa-231 की half-life 32,760 years है। मुख्य decay mode: α decay → Ac-227 (100%)।
Identification
- तत्व
- Protactinium (Pa)
- Atomic number Z
- 91
- Mass number A
- 231
- State
- Radioactive
Key quantities
- Half-life
- 32,760 years
- विशिष्ट गतिविधि
- 1.748e+9 Bq/g
- Gamma constant Γ
- —
- परिवहन के लिए A1 / A2 (SSR-6)
- 4 TBq / 0.0004 TBq
- D-value (НП-067-24)
- 0.06 TBq
Decay modes
- α decay → Ac-227 — 100 %
- spontaneous fission — 3e-10 %
Main gamma lines
| Energy, keV | Yield, % |
|---|---|
| 12.7 · X-ray line | 32.44 |
| 27.36 | 10.29 |
| 302.65 | 2.873 |
| 300.07 | 2.465 |
| 283.69 | 1.7 |
| 330.06 | 1.396 |
| 90.889 · X-ray line | 1.218 |
| 19 | 0.3811 |
| 16.5 | 0.3036 |
| 46.35 | 0.2227 |
Lines of the bare nuclide (ENDF/B-VIII.0), without daughter ingrowth.
Alpha and beta particles
| Radiation | Energy, keV | Yield, % |
|---|---|---|
| α | 5,013.8 | 25.4 |
| 4,951.3 | 22.8 | |
| 5,028.4 | 20 | |
| 5,058.6 | 11 |
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.