Nuclide reference
Hg-195 — Mercury-195
The half-life of Hg-195 is 10.53 h. Main decay mode: β⁺ decay / electron capture to Au-195 (97.81%).
Identification
- Element
- Mercury (Hg)
- Atomic number Z
- 80
- Mass number A
- 195
- State
- Radioactive
Key quantities
- Half-life
- 10.53 h
- Specific activity
- 5.647e+16 Bq/g
- Gamma constant Γ
- —
- D-value (НП-067-24)
- —
Decay modes
Main gamma lines
| Energy, keV | Yield, % |
|---|---|
| 68.807 · X-ray line | 38.83 |
| 66.993 · X-ray line | 22.72 |
| 779.8 | 7 |
| 61.46 | 6.37 |
| 585.13 | 2.044 |
| 180.11 | 1.953 |
| 599.66 | 1.834 |
| 207.1 | 1.617 |
| 261.75 (Au-195m) | 1.508 |
| 1,111.04 | 1.484 |
Includes daughter nuclides in equilibrium: Au-195m (yield per decay of Hg-195); the emitting nuclide is in brackets. Equilibrium is reached in about 3.6 min.
Alpha and beta particles
| Radiation | Energy, keV | Yield, % |
|---|---|---|
| β⁺, E max | 486.57 | 0.053 |
| 548 | 0.012 |
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.