Nuclide reference
Es-253 — Einsteinium-253
Es-253 की half-life 20.47 d है। मुख्य decay mode: α decay → Bk-249 (100%)।
Identification
- तत्व
- Einsteinium (Es)
- Atomic number Z
- 99
- Mass number A
- 253
- State
- Radioactive
Key quantities
- Half-life
- 20.47 d
- विशिष्ट गतिविधि
- 9.329e+14 Bq/g
- Gamma constant Γ
- —
- D-value (НП-067-24)
- —
Decay modes
- α decay → Bk-249 — 100 %
- spontaneous fission — 0.0000087 %
Main gamma lines
| Energy, keV | Yield, % |
|---|---|
| 15.304 · X-ray line | 1.139 |
| 19.5744 · X-ray line | 1.082 |
| 41.79 | 0.03083 |
| 389.18 | 0.0264 |
| 387.1 | 0.0181 |
| 51.96 | 0.006694 |
| 428.94 | 0.00604 |
| 381.1 | 0.00555 |
| 42.98 | 0.004 |
| 30.83 | 0.0032 |
Lines of the bare nuclide (ENDF/B-VIII.0), without daughter ingrowth.
Alpha and beta particles
| Radiation | Energy, keV | Yield, % |
|---|---|---|
| α | 6,632.5 | 89.9 |
| 6,590.5 | 6.6 | |
| 6,540 | 0.85 | |
| 6,624 | 0.8 |
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.