Characterization of a high lateral resolution and high sensitivity dosimeter for proton beams using inorganic scintillator detector

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Simonin, Gaël | Bash Chandra Debnath, Sree | Lalanne, Kévin | Tonneau, Didier | Lavandier, Sébastien | Rousseau, Marc | Brasse, David | Darreon, Julien | Fauquet, Carole

Edité par CCSD ; Institute of Electrical and Electronics Engineers -

International audience. In the context of proton dosimetry, detectors with high sensitivity and spatial resolution are needed to ensure the accurate monitoring of the deposited dose. The aim of this work is to study the response of a fiber-integrated inorganic scintillator detector under proton irradiation and to evaluate the effect of efficient volume on light collection. The results show that for a same incident energy flux, a larger volume results in a decrease of light collection. Mathematical modelling of the detection system is used to calculate dead times of the detection system elements and the scintillator’s light yield. The insertion of the optical fiber into the scintillator appears to be a critical parameter in the characterization of the detector, because its value has a major impact on light collection. These results help us to define the specifications for this dosimeter optimization, particularly for specific irradiation conditions such as FLASH-protontherapy or microdosimetry.

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