Nuclide reference
Ge-68 — Germanium-68
The half-life of Ge-68 is 270.95 d. Main decay mode: electron capture to Ga-68 (100%).
Identification
- Element
- Germanium (Ge)
- Atomic number Z
- 32
- Mass number A
- 68
- State
- Radioactive
Key quantities
- Half-life
- 270.95 d
- Specific activity
- 2.622e+14 Bq/g
- Gamma constant Γ
- —
- A1 / A2 for transport (SSR-6, НП-053-16)
- 0.5 TBq / 0.5 TBq
- D-value (НП-067-24)
- 0.07 TBq
Decay modes
- electron capture → Ga-68 — 100 %
Main gamma lines
| Energy, keV | Yield, % |
|---|---|
| 510.999 (Ga-68) · annihilation 511 keV | 178.3 |
| 9.252 · X-ray line | 25.75 |
| 9.225 · X-ray line | 13.25 |
| 1,077.34 (Ga-68) | 3.221 |
| 1,883.16 (Ga-68) | 0.1366 |
| 1,261.08 (Ga-68) | 0.09436 |
| 805.83 (Ga-68) | 0.09404 |
| 578.52 (Ga-68) | 0.03349 |
Includes daughter nuclides in equilibrium: Ga-68 (yield per decay of Ge-68); the emitting nuclide is in brackets. Equilibrium is reached in about 7.9 h.
Alpha and beta particles
| Radiation | Energy, keV | Yield, % |
|---|---|---|
| β⁺, E max | 1,899.1 (Ga-68) | 87.96 |
| 821.75 (Ga-68) | 1.2 |
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.