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 Fricke gelatin gel dosimeters was investigated and compared with Fricke agarose gel dosimeters in terms of sesitivity. After prepration of three different formulation of Fricke gelatin 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 Fricke gelatin gel sample with the prepared Fricke agarose gel samples confirm that Fricke agarose dosimeter is more sensitive than Fricke gelatin gel dosimeter.
- Optical absorbance study of Fricke gelatin gel dosimeters was performed.
- 80% reduction of dose response for a change in gelatin concentration from 3% to 8% by weight.
- Good repeatability and no dose rate dependence of the gel response.
- Fricke agarose gel dosimeter is more sensitive than Fricke gelatin gel dosimeter.