Nuclide reference
F-18 — Fluorine-18
The half-life of F-18 is 1.8295 h. Main decay mode: β⁺ decay / electron capture to O-18 (100%).
Identification
- Element
- Fluorine (F)
- Atomic number Z
- 9
- Mass number A
- 18
- State
- Radioactive
Key quantities
- Half-life
- 1.8295 h
- Specific activity
- 3.521e+18 Bq/g
- Gamma constant Γ (H*(10))
- 0.1652 µSv·m²/(MBq·h)
- Dose rate, 1 GBq at 1 m
- ≈ 165 µSv/h
- A1 / A2 for transport (SSR-6, НП-053-16)
- 1 TBq / 0.6 TBq
- D-value (НП-067-24)
- 0.06 TBq
Decay modes
- β⁺ decay / electron capture → O-18 — 100 %
Main gamma lines
| Energy, keV | Yield, % |
|---|---|
| 510.999 · annihilation 511 keV | 193.5 |
Lines of the bare nuclide (ENDF/B-VIII.0), without daughter ingrowth.
Alpha and beta particles
| Radiation | Energy, keV | Yield, % |
|---|---|---|
| β⁺, E max | 633.3 | 96.73 |
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.Dose rate example: point source, no shielding or scatter, Ḣ = Γ·A/r².