How important is the dose rate sensitivity of 2D and 3D radiation dosimeters?

Yves De Deene*

*Corresponding author for this work

Research output: Contribution to journalConference paper

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Abstract

Several kinds of chemical 3D radiation dosimeters have been fabricated to acquire the dose distribution in clinical radiotherapy. A legitimate concern with every new dosimeter is its dose rate dependent response because, the dose rate in each point of the phantom during a clinical treatment is unknown. Unfortunately, many 3D dosimeters have shown some degree of dose rate dependence. In practice, radiation dosimeters are mostly calibrated using a calibration curve that is obtained by irradiating calibration vials with different doses but using a fixed dose rate. Therefore, when applying a dose calibration to an experimentally obtained dose distribution, a deviation between the measured dose distribution and the actual dose distribution can be expected. In this computational study, the effect of a dose rate dependent dosimeter response on a theoretical dose distribution has been investigated. In order to compare the effect of dose rate, a gamma evaluation is performed between the predefined dose distribution and the dose distribution that is affected by a dose rate dependent radiation response. It is found that a dose rate difference of -10%, results in a gamma pass rate of 100% in the 3D dose distribution.

Original languageEnglish
Article number012059
Pages (from-to)1-6
Number of pages6
JournalJournal of Physics: Conference Series
Volume1305
Issue number1
DOIs
Publication statusPublished - 2019
Event10th International Conference on 3D Radiation Dosimetry - Kunshan, China
Duration: 16 Sep 201819 Sep 2018

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