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Comparative Analysis of Multilayer Lead Oxide-Based X-ray Detector Prototypes

Authors :
Emma Pineau
Oleksandr Grynko
Tristen Thibault
Alexander Alexandrov
Attila Csík
Sándor Kökényesi
Alla Reznik
Source :
Sensors, Vol 22, Iss 16, p 5998 (2022)
Publication Year :
2022
Publisher :
MDPI AG, 2022.

Abstract

Lead oxide (PbO) photoconductors are proposed as X-ray-to-charge transducers for the next generation of direct conversion digital X-ray detectors. Optimized PbO-based detectors have potential for utilization in high-energy and dynamic applications of medical X-ray imaging. Two polymorphs of PbO have been considered so far for imaging applications: polycrystalline lead oxide (poly-PbO) and amorphous lead oxide (a-PbO). Here, we provide the comparative analysis of two PbO-based single-pixel X-ray detector prototypes: one prototype employs only a layer of a-PbO as the photoconductor while the other has a combination of a-PbO and poly-PbO, forming a photoconductive bilayer structure of the same overall thickness as in the first prototype. We characterize the performance of these prototypes in terms of electron–hole creation energy (W±) and signal lag—major properties that define a material’s suitability for low-dose real-time imaging. The results demonstrate that both X-ray photoconductive structures have an adequate temporal response suitable for real-time X-ray imaging, combined with high intrinsic sensitivity. These results are discussed in the context of structural and morphological properties of PbO to better understand the preparation–fabrication–property relationships of this material.

Details

Language :
English
ISSN :
14248220
Volume :
22
Issue :
16
Database :
Directory of Open Access Journals
Journal :
Sensors
Publication Type :
Academic Journal
Accession number :
edsdoj.8038b96a7c44d44a01caab9ca41a822
Document Type :
article
Full Text :
https://doi.org/10.3390/s22165998