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Radiation protection aspects of a new high‐energy linear accelerator
Author(s) -
O'Brien P.,
Michaels H. B.,
Gillies B.,
Aldrich J. E.,
Andrew J. W.
Publication year - 1985
Publication title -
medical physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.473
H-Index - 180
eISSN - 2473-4209
pISSN - 0094-2405
DOI - 10.1118/1.595793
Subject(s) - linear particle accelerator , nova scotia , neutron , equivalent dose , radiation , dose rate , dosimetry , nuclear physics , physics , nuclear medicine , particle accelerator , radiation protection , nuclear engineering , environmental science , materials science , optics , beam (structure) , medical physics , engineering , medicine , geology , oceanography
The Therac‐25 is a new 25‐MeV linear accelerator manufactured by Atomic Energy of Canada, Ltd. The first two units have recently been installed in Toronto, Ontario and Halifax, Nova Scotia. Calculations and measurements of primary and secondary radiation levels were made. Neutron dose‐equivalent rates were measured inside and outside the room. The maximum leakage rate at 1 m from the accelerator target was 0.4% Sv per peak photon Gy. The tenth value layer for neutrons from the Therac‐25, at the entrance to a one‐legged maze was found to be 5.5 cm of polyethylene. Measurements were done to estimate daily technologist exposure due to induced activity in the treatment room.