Experimental study on Fricke gelatin gel dosimeters

‎Fricke gel dosimeters obtained by modifications on standard Fricke dosimeter presents some advantages like easy preparation‎, ‎tissue equivalence‎, ‎good reproducibility and dose mapping‎. ‎In this work‎, ‎dose response characteristics of Gelatin Fricke gel dosimeters was investigated and compared with Fricke agarose gel dosimeters in terms of sesitivity‎. ‎After prepration of three different formulation of Gelatin Fricke gel dosimeters and gamma irradiation of the samples‎, ‎a spectrophotometer was applied to measure the optical absorbance of the samples‎. ‎Results indicate a linear dose range response of 10 to 30 Gy‎, ‎as well as increased gelatin concentrations cause the sensitivity of the dosimeter to detereorate with a 80% reduction of dose response for a change in gelatin concentration from 3 to 8 weight percent‎. ‎Obtained coefficient variation verifies the good repeatability of the gel response‎. ‎The gel dosimeter has no dose rate dependence‎. ‎Comparison of the most sensitive Gelatin Fricke gel sample with the prepared Fricke agarose gel samples confirm that Fricke agarose dosimeter is more sensitive than Gelatin Fricke gel dosimeter‎.