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Cumulative Cherenkov emission resulting from delivery of 0.5 Gy dose to water phantom by 6 MV photon beam (a, b) and 6 MeV electron beam (c, d). Pixel size 1.7×1.7 mm2 at object plane. e) Comparison of normalized Cherenkov emission profiles (“Measurement”) with reference dosimetric data [15] of a 10×10 and 20×20 cm2 6 MV beam (top), and the resulting error (bottom).
