Butera, S;
Lioliou, G;
Zhao, S;
Krysa, AB;
Barnett, AM;
(2021)
InGaP 2 2 pixel array for X-ray and -ray spectroscopy.
Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
, 1010
, Article 165549. 10.1016/j.nima.2021.165549.
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Abstract
A 2 × 2 square pixel In0.5Ga0.5P p+-i-n+ mesa photodiode array was fabricated and investigated for its suitability in photon counting X-ray and γ-ray spectroscopy. Each pixel, which had an area of 200μm×200μm and a 5μm thick i layer, was coupled to a low-noise charge-sensitive preamplifier and standard onwards readout electronics to form an X-ray and γ-ray photon counting spectrometer. The pixels were illuminated in turn with an 55Fe radioisotope X-ray source, an 241Am radioisotope X-ray and γ-ray source, and a 109Cd radioisotope X-ray and γ-ray source. The mean value (across all pixels) of the best energy resolution (Full Width at Half Maximum, FWHM) at 20 °C was 770 eV ± 30 eV at 5.9 keV, 840 eV ± 20 eV at 22.16 keV, and 870 eV ± 30 eV at 59.54 keV. The spectroscopic response of one of the pixels was then investigated at temperatures up to 100 °C; noise analysis was performed and the different noise contributions were identified. The FWHM at 100 °C was 1.29 keV ± 0.04 keV at 5.9 keV, 1.32 keV ± 0.06 keV at 22.16 keV, 1.34 keV ± 0.06 keV at 59.54 keV, and 1.43 keV ± 0.08 keV at 88.03 keV. The results indicate that the detector did not suffer from incomplete charge collection, and that the spectrometer had better energy resolution at 100 °C than any other multi-pixel radiation spectrometer so far reported.
| Type: | Article |
|---|---|
| Title: | InGaP 2 2 pixel array for X-ray and -ray spectroscopy |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1016/j.nima.2021.165549 |
| Publisher version: | https://doi.org/10.1016/j.nima.2021.165549 |
| Language: | English |
| Additional information: | © 2021 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/). |
| Keywords: | Science & Technology, Technology, Physical Sciences, Instruments & Instrumentation, Nuclear Science & Technology, Physics, Nuclear, Physics, Particles & Fields, Physics, InGaP, X-ray photon counting spectroscopy, gamma-ray photon counting spectroscopy, Pixel array, GALLIUM-ARSENIDE, NOISE, ABSORPTION, PHOTON, ENERGY |
| UCL classification: | 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 UCL > Provost and Vice Provost Offices > UCL BEAMS UCL |
| URI: | https://discovery.ucl.ac.uk/id/eprint/10144033 |
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