High dose and phototransferred thermoluminescence in CaSO4, CaSO4:Dy, and CaSO4:Tm

An investigation is presented to test the feasibility of extending the usefulness of the CaSO4 phosphor doped with Tm or Dy into the high dose/high temperature regime. The doses studied ranged from I kGy to 100 kGy obtained from gamma ray and flash electron beam sources. Intregrated glow curve signals in the 'dosimetry range' (similar to 100-350 degrees C) and the high temperature range (similar to 350-600 degrees C) are measured as a function of dose. Integrated UV phototransferred thermoluminescence signals (similar to 100-300 degrees C) are similarly considered. For powdered samples doped to 0.1 mol.%, the onset of saturation occurs near 10 kGy. This establishes that thermoluminescence dosimetry for industrial food processing (pasteurisation, disinfestation, radicidation and radurisation) is a possibility.