Thirimanne, HM;
Jayawardena, KDGI;
Nisbet, A;
Shen, Y;
Bandara, RMI;
Mills, CA;
Shao, G;
(2020)
Hybrid Multipixel Array X-Ray Detectors for Real-Time Direct Detection of Hard X-Rays.
IEEE Transactions on Nuclear Science
, 67
(10)
pp. 2238-2245.
10.1109/tns.2020.3021612.
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Abstract
X-ray detectors currently employed in dosimetry suffer from a number of drawbacks including the inability to conform to curved surfaces and being limited to smaller dimensions due to available crystal sizes. In this study, a hybrid X-ray detector (HXD) has been developed which offers real-time response with added advantages of being highly sensitive over a broad energy range, mechanically flexible, relatively inexpensive, and able to be fabricated over large areas on the desired surface. The detector comprises an organic matrix embedded with high-atomic-number inorganic nanoparticles which increase the radiation attenuation and within the device allows for simultaneous transfer of electrons and holes. The HXD delivers a peak response of 14 nA cm −2 , which corresponds to a sensitivity of 30.8 μC Gy −1 cm −2 , under the exposure of 6-MV hard X-rays generated by a medical linear accelerator. The angular dependence of the HXD has been studied, which offers a maximum variation of 26% in the posterior versus lateral beam directions. The flexible HXD can be conformed to the human body shape and is expected to eliminate variations due to source-to-skin distance with reduced physical evaluation complexities.
| Type: | Article |
|---|---|
| Title: | Hybrid Multipixel Array X-Ray Detectors for Real-Time Direct Detection of Hard X-Rays |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1109/tns.2020.3021612 |
| Publisher version: | https://doi.org/10.1109/tns.2020.3021612 |
| Language: | English |
| Additional information: | This version is the author accepted manuscript. For information on re-use, please refer to the publisher’s terms and conditions. |
| Keywords: | Detectors , X-ray imaging , Films , X-ray detectors , Charge carrier processes , Sensitivity , Linear particle accelerator |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Med Phys and Biomedical Eng |
| URI: | https://discovery.ucl.ac.uk/id/eprint/10113519 |
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