Variation in depth of maximum dose of megavoltage photon beams

D. E. Velkley, J. A. Purdy

Research output: Contribution to journalArticlepeer-review


Build-up curves have been measured for clinical photon beams with energies from 1.2 to 25 MV. The position of the depth of maximum dose and the percentage depth dose in the build-up region has been found to depend sensitively upon field size for some machines. These effects are interpreted in terms of an electron component of the radiation field. The significance of the observations for megavoltage radiation therapy is discussed.

Original languageEnglish
Pages (from-to)40-44
Number of pages5
JournalApplied Radiology
Issue number1
StatePublished - Jan 1 1980


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