Nuclide reference
At-219 — Astatine-219
At-219 की half-life 56 s है। मुख्य decay mode: α decay → Bi-215 (97%)।
Identification
- तत्व
- Astatine (At)
- Atomic number Z
- 85
- Mass number A
- 219
- State
- Radioactive
Key quantities
- Half-life
- 56 s
- विशिष्ट गतिविधि
- 3.404e+19 Bq/g
- Gamma constant Γ
- —
- D-value (НП-067-24)
- —
Decay modes
Main gamma lines
| Energy, keV | Yield, % |
|---|---|
| 271.23 (Rn-219) | 0.3487 |
| 401.81 (Rn-219) | 0.2127 |
| 79.291 (Rn-219) · X-ray line | 0.02886 |
| 76.864 (Rn-219) · X-ray line | 0.01734 |
Includes daughter nuclides in equilibrium: Rn-219, Po-215 (yield per decay of At-219); the emitting nuclide is in brackets. Equilibrium is reached in about 30 s. Equilibrium with radon requires a sealed source.
Alpha and beta particles
| Radiation | Energy, keV | Yield, % |
|---|---|---|
| α | 6,208 | 97 |
| 6,819.1 (Rn-219) | 2.563 | |
| 6,552.6 (Rn-219) | 0.4164 | |
| 7,386.1 (Po-215) | 3.226 | |
| β⁻, E max | 1,566 | 3 |
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.