title: Response characteristics of a tandem ionization chamber in standard X-ray beams.
abstract: A tandem ionization chamber was developed for quality control programs of the kilovoltage X-ray equipment used in radiotherapy. This chamber was tested and calibrated in low-energy X-ray beams in accordance with international recommendations, and it showed a satisfactory level of performance, mainly with regard to its main use, namely formation of a tandem system for confirmation of half-value layers in X-radiation beams previously determined by the conventional method. In this developed system no absorbers or special setups are necessary.
authors.affiliation: Instituto de Pesquisas Energéticas e Nucleares, Comissão Nacional de Energia Nuclear, P.O. Box 11049, SP 05422-970, São Paulo, Brazil. amcosta@net.ipen.br
authors.forename: Alessandro M
authors.initials: AM
authors.lastname: Costa
authors.forename: Linda V E
authors.initials: LV
authors.lastname: Caldas
mesh_terms: D002138:Calibration; D016014:Linear Models; D011786:Quality Control; D011835:Radiation Protection / Q000592:standards; D011879:Radiotherapy Dosage / Q000592:standards; D012015:Reference Standards; D012680:Sensitivity and Specificity; D014964:X-Ray Therapy / Q000295:instrumentation* / Q000592:standards*