Fig. 1

Irradiation setup with cylindrical symmetry. Photograph of the gamma irradiation facility at the High Flux Isotope Reactor courtesy of Oak Ridge National Laboratory. Specimens are not directly exposed to water, but are housed inside the irradiation chamber in the middle of the fuel source, and are in direct contact with a purge gas (typically nitrogen) and thermal equilibrium is maintained by radiative heat transfer between the specimens and the chamber.