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Volume 15, Number 2, 2010

Energy dependence of radiochromic dosimetry films for use in radiotherapy verification

Krzysztof Chełmiński, Wojciech Bulski, Dietmar Georg, Dominika Bodzak, Zbigniew Maniakowski, Dominika Oborska, Joanna Rostkowska, Małgorzata Kania



The purpose of the study was to examine the energy dependence of Gafchromic EBT radiochromic dosimetry films, in order to assess their potential use in intensity-modulated radiotherapy (IMRT) verifications.

Materials and methods

The film samples were irradiated with doses from 0.1 to 12 Gy using photon beams from the energy range 1.25 MeV to 25 MV and the film response was measured using a flat-bed scanner. The samples were scanned and the film responses for different beam energies were compared.


A high uncertainty in readout of the film response was observed for samples irradiated with doses lower than 1 Gy. The relative difference exceeds 20% for doses lower than 1 Gy while for doses over 1 Gy the measured film response differs by less than 5% for the whole examined energy range. The achieved uncertainty of the experimental procedure does not reveal any energy dependence of Gafchromic EBT film response in the investigated energy range.


Gafchromic EBT film does not show any energy dependence in the conditions typical for IMRT but the doses measured for pre-treatment plan verifications should exceed 1 Gy.

Signature: Rep Pract Oncol Radiother, 2010; 15(2) : 40-46

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