Response overshoot: a challenge for the application of polymer gel dosimeters
- 9 Downloads
In this research response overshoots of the half irradiated PAGAT polymer gel dosimeter at variations post irradiation times were traced out. Results showed that 5 h after irradiation the measured dose by polymer gel dosimeter in boundary region are compatible with delivered dose. However, more elapsed time post irradiation caused misevaluation of dose. It was observed that response overshoot caused a maximum error of 28% in dose evaluation. It was concluded that more care is necessary when a high gradient dose distribution is evaluated by means of a polymer gel dosimeter.
KeywordsPolymer gel dosimeter PAGAT Response overshoot Dose distributions integrity MRI
This study was supported as a research project under Grant Number IKIU-10372 by Imam Khomeini International University, Qazvin, Iran. The author acknowledge the radiology and radiotherapy departments of Shohadae-Tajrish hospital, specially Mr. Masud Heidari and Mr. Ali Jabbari, for their kind efforts in gel dosimeters imaging and irradiation.
- 24.International Atomic Energy Agency (IAEA) (2000) Absorbed dose determination in external beam radiotherapy: an international code of practice for dosimetry based on standards of absorbed dose to water. Technical report series no. 398 (Vienna: IAEA)Google Scholar
- 33.Schreiner LJ (2006) Dosimetry in modern radiation therapy: limitations and needs. In: Preliminary proceeding of DOSGEL 2006—4th international conference on radiotherapy gel dosimetry. University of Sherbrooke, Sherbrooke (Quebec), CanadaGoogle Scholar
- 34.Ibbott GS (2006) Clinical applications of gel dosimeteres. In: Preliminary proceeding of DOSGEL 2006—4th international conference on radiotherapy gel dosimetry. University of Sherbrook, Sherbrook (Quebec), CanadaGoogle Scholar