  Intermediate level waste containers are used for the storage of an assortment
of radioactive waste. This waste is heat-generating and needs monitoring and so
this work was undertaken to determine whether the mean internal container
temperature can be inferred from the temperature of the vent. By using two
independent thermometry techniques, phosphor thermometry and thermal imaging,
the internal temperature was demonstrated to be proportional to the vent
temperature as measured by both methods. The correlation is linear and given
suitable characterisation could provide robust indication of the internal bulk
temperature.
