Abstract
Instrument AB Scanditronix offers a 6-MV therapeutic photon beam as an option with the 22-MeV medical microtron (MM 22). The method of acceleration, target assembly, and use of 2 flattening fibers produce beams having several characteristics (e.g., field flatness, penetration and intensity) that are superior to many 6-MV Linac beams. Characteristics of the microtron''s 6-MV photon beams including quality, surface dose, depth of maximum dose, peak dose rates, peak scatter factors, central axis percentage depth dose, tissue maximum ratios and beam profiles are described.

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