This database contains 55 high flux research reactors distributed over 28 Member States.
The analytical and research capabilities of a research reactor are determined primarily by the available thermal neutron flux. This database categorises research reactors as a low flux, medium flux, or high flux reactor according to the following levels of thermal neutron flux:
- low flux reactor (≤ 1 x 1012 n/cm2/s)
- medium flux reactor (> 1 x 1012 n/cm2/s and < 1 x 1014 n/cm2/s)
- high flux reactor (≥ 1 x 1014 n/cm2/s)

Core of reactor in operation (RA-3, Argentine)