title: A hybrid radiation detector for simultaneous spatial and temporal dosimetry.
abstract: In this feasibility study an organic plastic scintillator is calibrated against ionisation chamber measurements and then embedded in a polymer gel dosimeter to obtain a quasi-4D radiation detector. This hybrid dosimeter was irradiated with megavoltage x-rays from a linear accelerator, with temporal measurements of the dose rate being acquired by the scintillator and spatial measurements acquired with the gel dosimeter. The detectors employed in this study are radiologically equivalent; and we show that neither detector perturbs the intensity of the radiation field of the other. By employing these detectors in concert, spatial and temporal variations in the radiation intensity can now be detected and gel dosimeters can be calibrated for absolute dose from a single irradiation.
authors.affiliation: Physics, Faculty of Science and Technology, Queensland University of Technology, GPO Box 2434, Brisbane, QLD 4001, Australia.
authors.forename: C
authors.initials: C
authors.lastname: Poole
authors.forename: J V
authors.initials: JV
authors.lastname: Trapp
authors.forename: J
authors.initials: J
authors.lastname: Kenny
authors.forename: T
authors.initials: T
authors.lastname: Kairn
authors.forename: K
authors.initials: K
authors.lastname: Williams
authors.forename: M
authors.initials: M
authors.lastname: Taylor
authors.forename: R
authors.initials: R
authors.lastname: Franich
authors.forename: C M
authors.initials: CM
authors.lastname: Langton
mesh_terms: D002138:Calibration; D004867:Equipment Design; D005782:Gels / Q000528:radiation effects; D021621:Imaging, Three-Dimensional; D011108:Polymers / Q000528:radiation effects; D011874:Radiometry / Q000295:instrumentation / Q000379:methods; D011879:Radiotherapy Dosage; D011880:Radiotherapy Planning, Computer-Assisted / Q000379:methods*; D015203:Reproducibility of Results; D012588:Scintillation Counting / Q000295:instrumentation* / Q000379:methods
chemical_list: D005782:Gels; D011108:Polymers