First spectroscopic X-ray and beta results from a 400 μm diameter Al0.8Ga0.2As photodiode

Barnett, A M, Lees, J E and Bassford, D J (2013) First spectroscopic X-ray and beta results from a 400 μm diameter Al0.8Ga0.2As photodiode. Journal of Instrumentation, 8. P10014-P10014. ISSN 1748-0221

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Abstract

Results characterising the performance of thin (1 μm active layer) 400 μm diameter Al0.8Ga0.2As mesa photodiodes operated at room temperature are presented showing the spectral response under illumination with moderate energy X-rays (5.9 keV and 22.16 keV) from radioisotope X-ray sources (55Fe and 109Cd) and beta particles from a 14C source (endpoint energy = 156.48 keV). The X-ray FWHM is established as 1.95 keV at 5.9 keV and 22.16 keV, primarily limited by electronics noise from the preamplifier. The diodes show a spectral response to 14C beta particles, but the endpoint energy is not reached due to the detector's thinness. The X-ray results are compared with 200 μm diameter Al0.8Ga0.2As photodiodes previously characterised using X-ray radioisotope sources at our laboratory.

Item Type: Article
Schools and Departments: School of Engineering and Informatics > Engineering and Design
Subjects: Q Science > QB Astronomy
Q Science > QC Physics
Depositing User: Anna Barnett
Date Deposited: 13 Nov 2013 14:00
Last Modified: 13 Nov 2013 14:00
URI: http://sro.sussex.ac.uk/id/eprint/47022
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