Study on the Energy Response of EDR2 Film to Scanning Proton and Carbon Ion Beams
Objective To study the energy response of EDR2 film to scanning Proton and Carbon Ion Beams.Methods The same EDR2 film was irradiated by 9 kinds of uniform proton and carbon ion beams with a scanning range of 5 cm×5 cm,the same energy and different doses.After scanning,the average value of pixels within a 2 cm×2 cm area was obtained using Image J.The average value of pixels was converted to optical density(OD)value by calculation,and the slope of the fitted line representing the dose response factor(DRF)for the specific energy of protons and carbon ions was acquired.The DRFs of energies were compared and analyzed,and the response curves of EDR2 film to protons and carbon ions with different energies were obtained.Results For proton highest energy(218.56 MeV)and lowest energy(53.04 MeV),the DRF values were 0.52 OD/Gy and 0.40 OD/Gy.For carbon ion highest energy(424.89 MeV/u)and lowest energy(97.87 MeV/u),the DRF values were 0.25 OD/Gy and 0.11 OD/Gy.The DRF of EDR2 film for protons and carbon ions increased with beam energy increasing.Conclusion The EDR2 film presents significant variations of energy dependency when measuring the dose of carbon ions and protons.When using EDR2 film to measure the dose of protons and carbon ions with different energies,it is necessary to calibrate the energy response to improve the accuracy.
EDR2 filmdose response factorenergy responseoptical density
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万方数据
维普
