학술논문
InAs avalanche photodiodes for X-ray detection
Document Type
Conference
Source
2011 IEEE Nuclear Science Symposium Conference Record Nuclear Science Symposium and Medical Imaging Conference (NSS/MIC), 2011 IEEE. :2071-2073 Oct, 2011
Subject
Language
ISSN
1082-3654
Abstract
Pulse height spectra were obtained by irradiating 55Fe radioactive X-ray source on an InAs n-i-p APD cooled to 77K. The full width half maximum (FWHM) of the detected photopeak at 5.9 keV improves with increasing reverse bias. The FWHM decreases rapidly with gain from 2 keV at M = 1 to ∼950eV at M = 5.2, improving the minimum detectable energy and resolution of the APD. The larger than expected FWHM is due to non-optimised packaging that leads to increased leakage current of the detector.