Nuclide reference
Hg-195m — Mercury-195m
The half-life of Hg-195m is 1.7333 d. Main decay mode: isomeric transition to Hg-195 (54.2%).
Identification
- Element
- Mercury (Hg)
- Atomic number Z
- 80
- Mass number A
- 195
- State
- Radioactive
Key quantities
- Half-life
- 1.7333 d
- Specific activity
- 1.429e+16 Bq/g
- Gamma constant Γ
- —
- A1 / A2 for transport (SSR-6, НП-053-16)
- 3 TBq / 0.7 TBq
- D-value (НП-067-24)
- 0.2 TBq
Decay modes
Main gamma lines
| Energy, keV | Yield, % |
|---|---|
| 261.75 | 31.31 |
| 68.807 · X-ray line | 16.53 |
| 9.97675 · X-ray line | 10.63 |
| 560.27 | 7.099 |
| 387.87 | 2.179 |
| 37.09 | 1.943 |
| 200.38 | 0.8022 |
| 1,241.17 | 0.6332 |
| 525.75 | 0.4969 |
| 207.1 | 0.3691 |
Lines of the bare nuclide (ENDF/B-VIII.0), without daughter ingrowth.
Alpha and beta particles
| Radiation | Energy, keV | Yield, % |
|---|---|---|
| β⁺, E max | 404.48 | 0.011 |
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.