the use of polyvinyl chloride films dyed with methyl red in radiation dosimetry

background: the purpose of this work was to investigate the use of polyvinyl chloride (pvc) dyed with methyl red as a high dose radiation dosimetry. materials and methods: commercial pvc films from sabic made from resins pvc57s with thickness of 60 µm and methyl red with a molecular weight of 269.31 were used. irradiation was carried out using a 60co γ-ray generator with sources arranged in rectangular holder with a total activity of 73.6926 kci. absorbance measurements were made by jasco v- 630 uv-vis spectrophotometer. dose rate and irradiation temperature effects as well as post-irradiation storage in dark and indirect daylight conditions on dosimetry performance were also investigated. results: the results showed a linear relationship between the relative absorbance (response) and the absorbed dose at the wavelength 548 nm in the range of 0-150 kgy. the response was found to be independent of both dose rate and irradiation temperature. conclusion: the experimental results indicate that pvc films dyed with methyl red may be used for a high dose radiation dosimetry.