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Updated: Jul 13, 2026
Characterization of Recombination Effects in a Liquid Ionization Chamber Used for the Dosimetry of a Radiosurgical Accelerator
Published on: May 9, 2014
Set-up and calibration of a triple ionization chamber system for dosimetry in mixed neutron/photon fields
J Becker1, E Brunckhorst, A Roca
1Department of Radiotherapy and Radio-Oncology, University Medical Center, Hamburg-Eppendorf, University of Hamburg, Martinistr. 52, 20246 Hamburg, Germany. j.becker@uke.uni-hamburg.de
Abstract:
The aim of this study is to introduce a triple ionization chamber system to separate dose components of mixed neutron/photon fields. Fast and thermal neutron dose components have a different biological effectiveness than gamma dose components. If boron neutron capture is used to enhance the dose in certain areas of a patient, the precise knowledge of the thermal neutron flux is essential. A tissue equivalent and two magnesium ionization chambers have been prepared for use in a triple chamber system for this purpose. One of the magnesium chambers is coated with (10)B on the inside to enhance its response to thermal neutrons. All three chambers have been calibrated at a cobalt source, medical linear accelerators and several neutron sources. The chambers have been studied in Monte Carlo simulations and the results are compared with measurements.
