title: A high-precision, high-resolution and fast dosimetry system for beta sources applied in cardiovascular brachytherapy.
abstract: A fast dosimetry system based on plastic scintillator detectors has been developed which allows three-dimensional measurement of the radiation field in water of beta-sources appropriate for application in cardiovascular brachytherapy. This system fulfills the AAPM Task Group 60 recommendations for dosimetry of cardiovascular brachytherapy sources. To demonstrate the use of the system, measurements have been performed with an 90Y-wire source. The dose distribution was determined with a spatial resolution of better than 0.2 mm, with only a few minutes needed per scan. The scintillator dosemeter was absolutely calibrated in terms of absorbed dose to water with a precision of +/-7.5%. The relative precision achievable is +/-2.5%. The response of the system is linear within +/-2% for dose rates from 0.5 mGy s(-1) to 500 mGy s(-1).
authors.affiliation: Div. Clin. Radiation Physics, Essen University Hospital, Germany.
authors.forename: M
authors.initials: M
authors.lastname: Bambynek
authors.forename: D
authors.initials: D
authors.lastname: Flühs
authors.forename: U
authors.initials: U
authors.lastname: Quast
authors.forename: D
authors.initials: D
authors.lastname: Wegener
authors.forename: C G
authors.initials: CG
authors.lastname: Soares
mesh_terms: D001610:Beta Particles; D001918:Brachytherapy / Q000295:instrumentation* / Q000379:methods*; D002138:Calibration; D002318:Cardiovascular Diseases / Q000532:radiotherapy*; D006801:Humans; D010969:Plastics; D011874:Radiometry / Q000295:instrumentation* / Q000379:methods*; D015203:Reproducibility of Results; D012588:Scintillation Counting; D014867:Water; D015021:Yttrium Radioisotopes / Q000627:therapeutic use
chemical_list: D010969:Plastics; D015021:Yttrium Radioisotopes; D014867:Water