Arrangements for transferring energy in fission product isotope production reactors

An arrangement for transferring energy in a medical isotope production reactor comprises a liquid pool (15) and a liquid reactor core disposed within a vessel (10) immersed in the pool (15). The vessel wall (12) defines a reactive area and houses a fuel solution (25). The fuel solution (25) flows within the reactive area transporting the energy to the vessel wall (12). Heat transfer enhancers such as fins (30), tubes (14), rods or bars may extend from the inner and outer surfaces of the vessel wall (12) to add heat transfer surface and improve the heat transfer from the fuel solution (25) to the liquid pool (15). Baffles (18) may be added to the heat transfer enhancers to facilitate the flow of fluid.