Nuclide reference
Pt-197m — Platinum-197m
The half-life of Pt-197m is 1.5902 h. Main decay mode: isomeric transition to Pt-197 (96.7%).
Identification
- Element
- Platinum (Pt)
- Atomic number Z
- 78
- Mass number A
- 197
- State
- Radioactive
Key quantities
- Half-life
- 1.5902 h
- Specific activity
- 3.701e+17 Bq/g
- Gamma constant Γ
- —
- A1 / A2 for transport (SSR-6, НП-053-16)
- 10 TBq / 0.6 TBq
- D-value (НП-067-24)
- 0.9 TBq
Decay modes
Main gamma lines
| Energy, keV | Yield, % |
|---|---|
| 66.831 · X-ray line | 23.59 |
| 11.1249 · X-ray line | 20.7 |
| 346.5 | 11.39 |
| 279.01 (Au-197m) | 2.343 |
| 53.1 | 1.108 |
| 130.2 (Au-197m) | 0.1031 |
| 201.6 (Au-197m) | 0.03749 |
| 77.351 (Au-197m) | 0.01009 |
Includes daughter nuclides in equilibrium: Au-197m (yield per decay of Pt-197m); the emitting nuclide is in brackets. Equilibrium is reached in about 54 s.
Alpha and beta particles
| Radiation | Energy, keV | Yield, % |
|---|---|---|
| β⁻, E max | 709.29 | 3.3 |
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 is H*(10) at 1 m computed from ICRP-107 spectra (NIST µ_en/ρ, ICRP-74 Table A.21) including short-lived progeny in equilibrium (e.g. Cs-137/Ba-137m, Ra-226 series); specific activity uses molar mass M ≈ mass number A.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.