In situ Raman estimation of irradiation-induced heating of UO2

We present an in situ Raman estimation of the temperature increase of UO2 pellets induced by cyclotron He2+ ionic irradiation in different environments (Ar gas or water): For instance, in the Ar gas environment, the sample is heated to a temperature 150–200 °C (i.e., below the annealing temperature of UO2 defects). For water, the sample is heated from 30 to 80 °C, just below the range of the studtite/metastudtite and the schoepite/metaschoepite transitions.