Diethyl fumarate dimethyl formamide solution for high dose dosimetry

Dosimetric characterization of diethyl fumarate DEF in dimethyl formamide DMF solution was studied spectrophotometrically for possible application at high dose dosimetry in the range 1–125 kGy. The absorption spectra of irradiated solutions showed broad absorption bands between 325 and 400 nm with a shoulder at 350 nm. The absorbance increases with increasing the dose. Absorbance at 350, 360 and 370 nm was measured and plotted versus absorbed dose. Good response and linear relationship were found between absorbed dose and absorbance of DMF solution 20% in DEF in the range 1–60 kGy at the three measured wavelengths; in addition, a good linear absorbance response up to 125 kGy was found at 370 nm. Good dose rate independence was observed in the range 1–40 kGy/h, sufficient post-irradiation stability over a period of 800 h after irradiation and temperature independence within the range 0–60 °C was also observed.