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Signal amplification of fiber integrated X-ray detector and energy independence

Abstract : We developed a high spatial resolution and sensitive detector particularly suitable for radiation dose measurements in radiotherapy at small fields and X-ray imaging applications. The detector is based on a silica optical fiber whose sensitive terminal is functionalized by grafting Ag-doped ZnS scintillating materials that emit blue luminescence under X-ray irradiation. Due to the small scintillating head of the detector, the acquisition signal is quite low, and it is measured by a sensitive photon counter plugged at the other terminal of the fiber. The weaker signal can be enhanced significantly by adding a metal coating over the scintillator. Therefore, this study presents the effect of metal thickness and density on the signal amplification at high irradiation energies of 6 MeV and 15 MeV using a Linear Accelerator (LINAC). In addition, the stem effect was characterized for regular to small field beam size and shows that the detector is almost free from stem contribution during high energy irradiation.
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https://hal-amu.archives-ouvertes.fr/hal-03272238
Contributor : Sree Bash Chandra Debnath Connect in order to contact the contributor
Submitted on : Monday, June 28, 2021 - 11:10:03 AM
Last modification on : Friday, April 1, 2022 - 3:49:52 AM

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S.B.C. Debnath, J. Darreon, A. Tallet, A. Goncalves, D. Tonneau, et al.. Signal amplification of fiber integrated X-ray detector and energy independence. IEEE Sensors Journal, Institute of Electrical and Electronics Engineers, In press, pp.1-1. ⟨10.1109/JSEN.2021.3091660⟩. ⟨hal-03272238⟩

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