Novel polyvinyl alcohol film dosimeter containing 3-(4,5-Dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide dye for high dose application

• Published in: Nuclear engineering and technology Vol. 55; no. 9; pp. 3383 - 3387
• Main Authors: Khalid A. Rabaeh, Ahmed A. Basfar, Issra' M.E. Hammoudeh
• Format: Journal Article
• Language: Korean
• Published: 2023
• Subjects: Radio-chromic film; Gamma radiation; Formazan; Polyvinyl alcohol; 3-(4,5-Dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide; Optical absorbance
• ISSN: 1738-5733; 2234-358X

A new dyed polyvinyl alcohol (PVA) film dosimeter based on 3-(4,5-Dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide (MMT) tetrazolium dye is proposed in this study for measuring high gamma radiation dose. Gamma cell irradiator that contains Co-60 gamma-ray source was used to expose the novel MMT-PVA films to different doses up to 25 kGy. The changed in optical property of irradiated and unirradiated films were characterized by UV-Vis spectrophotometer. The results show that the dose sensitive and the linear range of irradiated films were increased considerably with increase of MMT concentration from 1 to 5 mM. The dose response of dyed PVA film changed substantially with changing relative humidity (12-74%) as well as irradiation temperature (10-40 ℃). The absorbance of the unirradiated films does not change up to 10 days in dark while a significant increase in their absorbance was reported for similar films under fluorescent light. The irradiated dosimeters that kept in dark showed a perfect stability for 54 days. It was found that no obvious impact of dose rate on the irradiated MMT-PVA film dosimeters.