title: Quality audit of megavoltage radiotherapy units: intercomparison of dose at a reference point using a mailed TL-dosimetry system.
abstract: A dosimetry intercomparison based on mailed TL-dosimeters and the well proven IAEA/EORTC phantom is described. Its aim is to identify discrepancies in dosimetry larger than +/- 3%. Dosimeters were mailed to all radiotherapy centres in Switzerland for irradiation with 2 Gy at a reference point in a water container, using photons and electrons. Thirty-six beams were monitored. The results show an agreement of within 2% for the majority of the beams monitored. Two electron beams were at 6% of the reference value.
authors.affiliation: Radiation Oncology Department, University Hospital, Zurich, Switzerland.
authors.forename: B
authors.initials: B
authors.lastname: Davis
authors.forename: P
authors.initials: P
authors.lastname: Faessler
mesh_terms: D003037:Cobalt Radioisotopes; D004583:Electrons; D008961:Models, Structural; D011785:Quality Assurance, Health Care; D011874:Radiometry; D011879:Radiotherapy Dosage; D011882:Radiotherapy, High-Energy / Q000295:instrumentation / Q000592:standards*; D014965:X-Rays
chemical_list: D003037:Cobalt Radioisotopes