Nuclide reference
Tl-209 — Thallium-209
Tl-209 की half-life 2.2 min है। मुख्य decay mode: β⁻ decay → Pb-209 (100%)।
Identification
- तत्व
- Thallium (Tl)
- Atomic number Z
- 81
- Mass number A
- 209
- State
- Radioactive
Key quantities
- Half-life
- 2.2 min
- विशिष्ट गतिविधि
- 1.513e+19 Bq/g
- Gamma constant Γ
- —
- D-value (НП-067-24)
- —
Decay modes
- β⁻ decay → Pb-209 — 100 %
Main gamma lines
| Energy, keV | Yield, % |
|---|---|
| 1,567.09 | 99.81 |
| 465.13 | 96.9 |
| 117.211 | 84.3 |
| 74.97 · X-ray line | 10.51 |
| 72.807 · X-ray line | 6.238 |
| 920.13 | 0.6105 |
| 1,239.16 | 0.4554 |
Lines of the bare nuclide (ENDF/B-VIII.0), without daughter ingrowth.
Alpha and beta particles
| Radiation | Energy, keV | Yield, % |
|---|---|---|
| β⁻, E max | 1,827.6 | 98.8 |
| 907.44 | 0.61 | |
| 588.41 | 0.46 | |
| 1,944.8 | 0.05 |
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.