A method of spectrometric photon dosimetry for integrally and nuclide-specifically determining a gamma dose rate for X-ray and gamma radiation. The tread includes a vulcanized polymer base having at least a first silica-based reinforcing filler. Spill management embodiments for a number of fixed and movable tray ice makers are disclosed. Color temperature data on the image data is obtained based on image data obtained by performing image pickup by flashing the light-emitting unit based on the parameters.