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 do se/high temperature regime. The doses studied ranged from I kGy to 100 kGy obtained from gamma ray and flash electron beam sources. Intregra ted glow curve signals in the 'dosimetry range' (similar to 100-350 de grees C) and the high temperature range (similar to 350-600 degrees C) are measured as a function of dose. Integrated UV phototransferred th ermoluminescence signals (similar to 100-300 degrees C) are similarly considered. For powdered samples doped to 0.1 mol.%, the onset of satu ration occurs near 10 kGy. This establishes that thermoluminescence do simetry for industrial food processing (pasteurisation, disinfestation , radicidation and radurisation) is a possibility.