title: Technical note: the measurement of mammographic room protection.
abstract: Owing to the inherent design of mammographic X-ray tubes, transmission measurements through the surrounding protective barriers are difficult to obtain using the primary beam. An alternative method has been developed which employs an iodine-125 source. Transmission measurements were obtained through common building materials using both the iodine-125 source and a mammographic X-ray beam generated at 35 kVp. Measurements were converted into an aluminium equivalence, from which correction factors were calculated to convert the aluminium equivalence determined using iodine-125 to the true aluminium equivalence. Average correction factors for samples of glass, chipboard and plasterboard were 1.10, 0.75, and 0.85, respectively.
authors.affiliation: North Western Medical Physics Department, Christie Hospital NHS Trust, Manchester, UK.
authors.forename: C H
authors.initials: CH
authors.lastname: Johnson
authors.forename: A
authors.initials: A
authors.lastname: Walker
mesh_terms: D003252:Construction Materials / Q000592:standards; D005160:Facility Design and Construction / Q000592:standards*; D006801:Humans; D007457:Iodine Radioisotopes; D008327:Mammography / Q000592:standards*; D011835:Radiation Protection / Q000592:standards*; D011874:Radiometry
chemical_list: D007457:Iodine Radioisotopes