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Dose profile at entrance plane of U87 tumor mice microbeam radiation therapy, recorded by Gafchromic EBT2 film and analyzed using FilmQAPro program (multi-channel dosimetry) (Ashland Advanced Materials, KY, USA). The peak-to-valley-dose-ratio was measured to be 16 with 280-μm wide microbeams separated at 900 μm center-to-center distance. FWHM: Full-width-half-maximum.
