Nuclide reference
Rn-222 — Radon-222
Rn-222 की half-life 3.8235 d है। मुख्य decay mode: α decay → Po-218 (100%)।
Identification
- तत्व
- Radon (Rn)
- Atomic number Z
- 86
- Mass number A
- 222
- State
- Radioactive
Key quantities
- Half-life
- 3.8235 d
- विशिष्ट गतिविधि
- 5.692e+15 Bq/g
- Gamma constant Γ
- —
- परिवहन के लिए A1 / A2 (SSR-6)
- 0.3 TBq / 0.004 TBq
- D-value (НП-067-24)
- 0.04 TBq
Decay modes
- α decay → Po-218 — 100 %
Main gamma lines
| Energy, keV | Yield, % |
|---|---|
| 609.32 (Bi-214) | 45.9 |
| 351.932 (Pb-214) | 35.79 |
| 295.223 (Pb-214) | 18.52 |
| 1,764.49 (Bi-214) | 15.44 |
| 1,120.29 (Bi-214) | 15.06 |
| 77.109 (Pb-214) · X-ray line | 9.956 |
| 241.995 (Pb-214) | 7.289 |
| 74.817 (Pb-214) · X-ray line | 5.948 |
| 1,238.12 (Bi-214) | 5.887 |
| 2,204.06 (Bi-214) | 4.969 |
Includes daughter nuclides in equilibrium: Po-218, Pb-214, Bi-214, Po-214 (yield per decay of Rn-222); the emitting nuclide is in brackets. Equilibrium is reached in about 3.1 h. In transient equilibrium a daughter's activity exceeds the parent's, so a yield can be above 100%.
Alpha and beta particles
| Radiation | Energy, keV | Yield, % |
|---|---|---|
| α | 5,489.5 | 99.92 |
| 4,986 | 0.078 | |
| 6,002.3 (Po-218) | 100 | |
| 7,686.8 (Po-214) | 100.9 | |
| β⁻, E max | 667.07 (Pb-214) | 46.14 |
| 723.78 (Pb-214) | 40.41 | |
| 3,270 (Bi-214) | 19.27 | |
| 1,540.4 (Bi-214) | 17.73 |
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.