We assessed the accuracy of a prototype radiation detector with a built in CMOS amplifier for use in dosimetry for high dose rate brachytherapy. The detectors were fabricated on two substrates of epitaxial high resistivity silicon. The radiation detection performance of prototypes has been tested by ion beam induced charge (IBIC) microscopy using a 5.5 MeV alpha particle microbeam. We also carried out the HDR Ir-192 radiation source tracking at different depths and angular dose dependence in a water equivalent phantom. The detectors show sensitivities spanning from (5.8 ± 0.021) × 10−8 to (3.6 ± 0.14) × 10−8 nC Gy−1 mCi−1 mm−2. The depth variation of the dose is within 5% with that calculated by TG-43. Higher discrepancies are recorded for 2 mm and 7 mm depths due to the scattering of secondary particles and the perturbation of the radiation field induced in the ceramic/golden package. Dwell positions and dwell time are reconstructed within ±1 mm and 20 ms, respectively. The prototype detectors provide an unprecedented sensitivity thanks to its monolithic amplification stage. Future investigation of this technology will include the optimisation of the packaging technique.

Preliminary Characterization of an Active CMOS Pad Detector for Tracking and Dosimetry in HDR Brachytherapy / Bui, Thi Ngoc Hang; Large, Matthew; Poder, Joel; Bucci, Joseph; Bianco, Edoardo; Giampaolo, Raffaele Aaron; Rivetti, Angelo; Da Rocha Rolo, Manuel; Pastuovic, Zeljko; Corradino, Thomas; Pancheri, Lucio; Petasecca, Marco. - In: SENSORS. - ISSN 1424-8220. - 24:2(2024). [10.3390/s24020692]

Preliminary Characterization of an Active CMOS Pad Detector for Tracking and Dosimetry in HDR Brachytherapy

Corradino, Thomas;Pancheri, Lucio
Penultimo
;
2024-01-01

Abstract

We assessed the accuracy of a prototype radiation detector with a built in CMOS amplifier for use in dosimetry for high dose rate brachytherapy. The detectors were fabricated on two substrates of epitaxial high resistivity silicon. The radiation detection performance of prototypes has been tested by ion beam induced charge (IBIC) microscopy using a 5.5 MeV alpha particle microbeam. We also carried out the HDR Ir-192 radiation source tracking at different depths and angular dose dependence in a water equivalent phantom. The detectors show sensitivities spanning from (5.8 ± 0.021) × 10−8 to (3.6 ± 0.14) × 10−8 nC Gy−1 mCi−1 mm−2. The depth variation of the dose is within 5% with that calculated by TG-43. Higher discrepancies are recorded for 2 mm and 7 mm depths due to the scattering of secondary particles and the perturbation of the radiation field induced in the ceramic/golden package. Dwell positions and dwell time are reconstructed within ±1 mm and 20 ms, respectively. The prototype detectors provide an unprecedented sensitivity thanks to its monolithic amplification stage. Future investigation of this technology will include the optimisation of the packaging technique.
2024
2
Bui, Thi Ngoc Hang; Large, Matthew; Poder, Joel; Bucci, Joseph; Bianco, Edoardo; Giampaolo, Raffaele Aaron; Rivetti, Angelo; Da Rocha Rolo, Manuel; Pastuovic, Zeljko; Corradino, Thomas; Pancheri, Lucio; Petasecca, Marco
Preliminary Characterization of an Active CMOS Pad Detector for Tracking and Dosimetry in HDR Brachytherapy / Bui, Thi Ngoc Hang; Large, Matthew; Poder, Joel; Bucci, Joseph; Bianco, Edoardo; Giampaolo, Raffaele Aaron; Rivetti, Angelo; Da Rocha Rolo, Manuel; Pastuovic, Zeljko; Corradino, Thomas; Pancheri, Lucio; Petasecca, Marco. - In: SENSORS. - ISSN 1424-8220. - 24:2(2024). [10.3390/s24020692]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11572/409535
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