Study on Characteristics of Fricke Xylenol Orange Gelatin Dosimeters

The response of Fricke xylenol orange gelatin dosimeter has been studied to investigate the possibility of achieving a calibration method based on a preirradiation procedure. With this aim, different preirradiation parameters have been tested, and the system response to subsequent irradiations has been investigated. Both Fricke gel layers and cuvettes were considered, and no dependence on shape and wall material was observed. An increase of the system response was observed, depending on the total absorbed dose and not on the number of subsequent irradiations performed, as evidenced by the changes of the absorption spectra shapes. Moreover, different calibration curves, and consequently different sensitivities, were obtained with different preirradiation parameters. In order to propose a calibration procedure, further studies are of fundamental importance to deeper comprehending the influence of preirradiation parameters on the system sensitivity and response. In particular, a systematic analysis of the whole absorption spectra has proved to be central.