Journal
PHYSICS IN MEDICINE AND BIOLOGY
Volume 64, Issue 20, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/1361-6560/ab4460
Keywords
diode detectors; dosimetry; mathematical model; recombination
Funding
- Instituto de Salud Carlos III (ISCIII) (FEDER) [PI17/01428, DTS17/00123]
- ISCIII through a Miguel Servet II grant (FEDER) [CPII17/00028]
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Diodes dosimeters present a complex response to pulsed beams, with diode sensitivity varying with dose-per-pulse, monitor unit rate (time between pulses) or number of integrated pulses. Such a response is caused by the complex kinetics of the interplay among charge carriers, recombination-generation centers, which capture excess minority charge carriers and facilitate recombination with a majority charge carrier, and traps with energy levels close to the conduction/valence band, which can trap and release charge carriers. This behavior has been well characterized experimentally, and modeled with phenomenological models. In this work we present a kinetic multi-compartment model of the response of diode detectors, which includes the interplay among charge carriers, recombination-generation centers, and traps. The model can qualitatively fit experimental data extracted from the literature on diode response versus dose-per-pulse, monitor unit rate (time between pulses), or number of integrated pulses. In this regard, our work provides further insight on the response of diode detectors, and a theoretical framework for the development of simple phenomenological models.
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