Dosimetric properties of two kinds of clear polymethylmethacrylate (PMMA) and one kind of clear polystyrene (PS) sheets in technological accelerator irradiations, are presented. Absorbance of the sheets and its dependence on the dose have been measured at a suitable wavelength using a UV/VIS spectrophotometer.
Both kinds of PMMA can be used for technological dose measurements but each of them in the different range of the doses (~2 to ~30 kGy and ~30 to above 200 kGy). Heating the samples after irradiation accelerates the stabilization of the absorbance, which change slowly during the storage of the samples if not heated.
Absorbance of clear PS sheets decreases very much during the storage after irradiation, and heating of the samples does not accelerate the stabilization of the value. It can be said that the PS investigated is not suitable for technological dose measurements in accelerator irradiations.