Abstract
Recombination of charge carriers can affect the response of ionization detectors used for the dosimetry of radiotherapy fields. In this work, we present a method for correcting online the recombination effects in arrays of ionization chambers irradiated with time-varying dose rates. The method is based on the characterization of the dose rate/recombination response of the detector, and the measurement of the instant ionization current in the detector, rather than the integrated charge. The proposed method was investigated with simulations of the response of different air and liquid ionization chambers in situations where recombination can be large. In addition, we experimentally investigated the application of the method with an in-house-developed liquid-filled ionization chamber. The proposed online correction method can compensate for recombination losses and seems feasible to implement in the software of ionization arrays/detectors used for the dosimetry of radiotherapy fields.
Highlights
We have presented a method for real-time recombination correction in the dosimetry of dose rate varying radiotherapy treatments with arrays of ionization chambers
We have investigated the application of the method both with simulations of the response of ionization detectors and with preliminary experimental measurements taken with a liquid-filled ionization chamber, showing that the method seems feasible and accurate for the correction for recombination in dose-rate-varying radiotherapy verifications
We have presented a method for the real-time recombination correction in dosimetry with arrays of ionization chambers
Summary
Recombination in air and liquid ionization chambers is well understood, and there exist validated models and correction methods (like the two-voltage-method in air-filled ionization chambers for moderate dose rates) that can be employed to correct the reading of an ionization detector [14,15]. These methods can be applied in static situations when the dose rate in the detector does not change with time
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
