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We have simulated the head geometry of a Varian Clinac 21OOU23OOC medical accelerator in a Monte Carlo calculation to produce photoneutrons and transport them through the head shielding into a typical therapy room (modeled by a test cell at Varian Associates). The fast neutron leakage fluence and energy spectra have been calculated at 7 positions around the linac head for typical beam operation-it 10, 15, 18 and 20 MV. The results of these calculations have been compared with limiteddoi:10.1097/00004032-199801000-00005 pmid:9415580 fatcat:prvwgns7lvh75kzqawohspcpky