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In this experimental work, guar gum powder was exposed to gamma radiation from a  60 Co source at absorbed doses of 0, 10, 30, 50, 80, 100, 150 kGy at dose rate of 1.62 Gy/s. Raman spectroscopy was applied to measure the intensity of the samples ranging from of 500–4600 cm −1 . The intensity versus Raman shift was evaluated at 3800–4000 cm −1 . Then the curve was fitted linearly. The slope of the lines was determined in each absorbed dose. Results indicated that the absolute values of the slope of each line were enhanced with increasing the absorbed dose. This trend was linear within the absorbed dose ranging from of 0–50 kGy, in which was saturated after 80 kGy. Results showed that guar gum can be applied as a passive dosimeter at radiation processing level.

Investigation of the dose-response linearity of guar gum for gamma-ray dosimetry at radiation processing levels using Raman spectroscopy