Application of EBT3 Film in Heavy Ion Quality Control
Objective To analyze the response characteristics of EBT3 film to heavy ion beam and explore its application in heavy ion quality control.Methods The EBT3 film was irradiated by 6 MV photons and heavy ion beams of various energies.The net optical density analysis method was introduced to explore the dose-response of the EBT3 film to heavy ion beams.The EBT3 film was utilized to measure the heavy ion field,beam spot,heavy ion peak position and virtual source wheelbase,and the results were compared with PTW 1500XDR ionization chamber matrix and Markus ionization chamber.Results Dose calibration of EBT3 film was performed using net optical density analysis.The range of heavy ion linear energy transfers(LET)was 12.660-19.071 keV/μm,and the range of film net optical density was 0.05-0.40.The dose response of the film to carbon ion beam was 85.71%-95.62%of photons.In the range measurement,compared with PTW 34070-34080 ionization chamber,the dose response was 39.43%-85.88%.In the measurement of field flatness,compared with the PTW 1500XDR ionization chamber,the matrix deviation was-0.50%±1.13%,and the deviation of field size was 4.1 mm.Conclusion The study reveals that the EBT3 film dose-response of carbon ion beams is affected by the LET value and can only be used for absolute dose measurement under specific conditions.In most cases,the EBT3 film can only be used for the measurement of intensities and relative values.However,considering the intuitive nature and high spatial resolution of film results,some of the measurement results are more useful for reference,and it can be employed in the quality control of heavy ion facilities to enhance work efficiency and accuracy.
EBT3 filmnet optical densityheavy iondose-responselinear energy transfers(LET)quality control
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