Radiation Dosimetry Using Dyed and Undyed Polymethylmethacrylate Plastics

摘要

Indigenously manufactured polymethylmethacrylate (PMMA) sheets of different types (2 and 3 mm thick clear PMMA, 2 mm thick red PMMA, 3 mm thick blue PMMA and 2 mm thick brown PMMA) have been investigated spectrophotometrically for their suitability as radiation dosimeters. The response characteristics of these plastic strips in terms of change in optical absorbance over a wide range of absorbed dose of gamma-rays from a cobalt-60 ionizing radiation source were studied. Various environmental factors that can affect the response characteristics of the systems have also been studied and possible reasons for these effects have been discussed. Fricke dosimetry was used to determine dose-rate at the irradiation position in the radiation chamber of cobalt-60 source.