Farshid Pourranjbar - Physics Department‎, ‎Imam Khomeini International University‎, ‎Iran
Elham Edalatkhah - Radiation Applications Research School‎, ‎Nuclear Science and Technology Research Institute‎, ‎۱۴۱۵۵-۱۳۳۹‎, ‎Tehran‎, ‎Iran
Seyed Mohammad Mahdi Abtahi - Physics Department‎, ‎Imam Khomeini International University‎, ‎Iran

‎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 ۱۰ to ۳۰ Gy‎, ‎as well as increased gelatin concentrations cause the sensitivity of the dosimeter to detereorate with a ۸۰% reduction of dose response for a change in gelatin concentration from ۳ to ۸ 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.

Fricke gel dosimeters, Gelatin, Agarose, Response curve