Nuclide reference
Ga-68 — Gallium-68
The half-life of Ga-68 is 1.1285 h. Main decay mode: β⁺ decay / electron capture to Zn-68 (100%).
Identification
- Element
- Gallium (Ga)
- Atomic number Z
- 31
- Mass number A
- 68
- State
- Radioactive
Key quantities
- Half-life
- 1.1285 h
- Specific activity
- 1.511e+18 Bq/g
- Gamma constant Γ (H*(10))
- 0.1576 µSv·m²/(MBq·h)
- Dose rate, 1 GBq at 1 m
- ≈ 158 µSv/h
- 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
- β⁺ decay / electron capture → Zn-68 — 100 %
Main gamma lines
| Energy, keV | Yield, % |
|---|---|
| 510.999 · annihilation 511 keV | 178.3 |
| 1,077.34 | 3.22 |
| 8.639 · X-ray line | 2.635 |
| 8.616 · X-ray line | 1.353 |
| 1,883.16 | 0.1365 |
| 1,261.08 | 0.09435 |
| 805.83 | 0.09402 |
| 578.52 | 0.03349 |
| 1,744.42 | 0.009499 |
| 2,338.4 | 0.001127 |
Lines of the bare nuclide (ENDF/B-VIII.0), without daughter ingrowth.
Alpha and beta particles
| Radiation | Energy, keV | Yield, % |
|---|---|---|
| β⁺, E max | 1,899.1 | 87.94 |
| 821.75 | 1.2 |
For β⁺ the endpoint (maximum) energy of the spectrum is given. ENDF/B-VIII.0.
Related calculators
Other isotopes of this element
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.Dose rate example: point source, no shielding or scatter, Ḣ = Γ·A/r².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.