title: Access control systems for radiotherapy treatment rooms.
abstract: The role of the time-delay or start-up switch as a safety feature in radiotherapy treatment rooms is discussed. A simple optical system which can be retrofitted to any treatment room is described.
authors.affiliation: Cancer Treatment and Research Foundation of Nova Scotia, Halifax.
authors.forename: J E
authors.initials: JE
authors.lastname: Aldrich
authors.forename: J
authors.initials: J
authors.lastname: Berkey
mesh_terms: D006748:Hospital Departments; D006749:Hospital Design and Construction; D006801:Humans; D011835:Radiation Protection; D011872:Radiology Department, Hospital; D011878:Radiotherapy