Nuclide reference
Ra-224 — Radium-224
Ra-224 की half-life 3.66 d है। मुख्य decay mode: α decay → Rn-220 (100%)।
Identification
- तत्व
- Radium (Ra)
- Atomic number Z
- 88
- Mass number A
- 224
- State
- Radioactive
Key quantities
- Half-life
- 3.66 d
- विशिष्ट गतिविधि
- 5.893e+15 Bq/g
- Gamma constant Γ
- —
- परिवहन के लिए A1 / A2 (SSR-6)
- 0.4 TBq / 0.02 TBq
- D-value (НП-067-24)
- 0.05 TBq
Decay modes
- α decay → Rn-220 — 100 %
Main gamma lines
| Energy, keV | Yield, % |
|---|---|
| 238.632 (Pb-212) | 49.62 |
| 2,614.51 (Tl-208) | 41.3 |
| 583.187 (Tl-208) | 35.19 |
| 77.109 (Pb-212) · X-ray line | 19.17 |
| 74.817 (Pb-212) · X-ray line | 11.45 |
| 510.77 (Tl-208) | 9.356 |
| 727.33 (Bi-212) | 7.677 |
| 860.557 (Tl-208) | 5.175 |
| 240.986 | 4.1 |
| 300.087 (Pb-212) | 3.756 |
Includes daughter nuclides in equilibrium: Rn-220, Po-216, Pb-212, Bi-212, Po-212, Tl-208 (yield per decay of Ra-224); the emitting nuclide is in brackets. Equilibrium is reached in about 3.5 d. In transient equilibrium a daughter's activity exceeds the parent's, so a yield can be above 100%. Equilibrium with radon requires a sealed source.
Alpha and beta particles
| Radiation | Energy, keV | Yield, % |
|---|---|---|
| α | 5,685.4 | 94.92 |
| 6,288.1 (Rn-220) | 99.9 | |
| 6,778.3 (Po-216) | 100 | |
| 8,784.9 (Po-212) | 73.75 | |
| β⁻, E max | 331.27 (Pb-212) | 94.57 |
| 569.9 (Pb-212) | 13.54 | |
| 2,252.1 (Bi-212) | 63.74 | |
| 1,801.3 (Tl-208) | 20.33 |
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.