Nuclide reference
As-77 — Arsenic-77
As-77 की half-life 1.6179 d है। मुख्य decay mode: β⁻ decay → Se-77 (99.67%)।
Identification
- तत्व
- Arsenic (As)
- Atomic number Z
- 33
- Mass number A
- 77
- State
- Radioactive
Key quantities
- Half-life
- 1.6179 d
- विशिष्ट गतिविधि
- 3.878e+16 Bq/g
- Gamma constant Γ
- —
- परिवहन के लिए A1 / A2 (SSR-6)
- 20 TBq / 0.7 TBq
- D-value (НП-067-24)
- 8 TBq
Decay modes
- β⁻ decay → Se-77 — 99.67 %
- β⁻ decay → Se-77m — 0.3329 %
Main gamma lines
| Energy, keV | Yield, % |
|---|---|
| 239.011 | 1.59 |
| 520.654 | 0.5581 |
| 249.805 | 0.3943 |
| 87.854 | 0.2019 |
| 162 (Se-77m) | 0.1772 |
| 281.642 | 0.05788 |
| 11.223 (Se-77m) · X-ray line | 0.04415 |
| 11.182 (Se-77m) · X-ray line | 0.02274 |
| 139.243 | 0.009858 |
| 270.85 | 0.008268 |
Includes daughter nuclides in equilibrium: Se-77m (yield per decay of As-77); the emitting nuclide is in brackets. Equilibrium is reached in about 2 min.
Alpha and beta particles
| Radiation | Energy, keV | Yield, % |
|---|---|---|
| β⁻, E max | 683 | 97 |
| 443.99 | 1.6 | |
| 162.35 | 0.63 | |
| 433.2 | 0.63 |
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.