title: Does the megavoltage beam get harder or softer with depth?
authors.forename: M
authors.initials: M
authors.lastname: Geso
authors.forename: T
authors.initials: T
authors.lastname: Ackerly
mesh_terms: D055592:Biophysical Phenomena; D001703:Biophysics; D006801:Humans; D009010:Monte Carlo Method; D017785:Photons / Q000627:therapeutic use; D011882:Radiotherapy, High-Energy; D012542:Scattering, Radiation