Development of compound semiconductor arrays for x- and gamma-ray spectroscopy

Alan Owens; Hans Andersson; Marcos Bavdaz; G. Brammertz; Christian Erd; Thomas Gagliardi; V. Gostillo; N. Haack; I. Lisjutin; Seppo Arvo Anter Nenonen; Anthony J. Peacock; Heikki Sipila; Ivor Taylor; Sergey Zatoloka

doi:10.1117/12.450771

18 December 2001 Development of compound semiconductor arrays for x- and gamma-ray spectroscopy

Alan Owens, Hans Andersson, Marcos Bavdaz, G. Brammertz, Christian Erd, Thomas Gagliardi, V. Gostillo, N. Haack, I. Lisjutin, Seppo Arvo Anter Nenonen, Anthony J. Peacock, Heikki Sipila, Ivor Taylor, Sergey Zatoloka

Author Affiliations +

Proceedings Volume 4507, Hard X-Ray and Gamma-Ray Detector Physics III; (2001) https://doi.org/10.1117/12.450771
Event: International Symposium on Optical Science and Technology, 2001, San Diego, CA, United States

Abstract

We present preliminary results of X-ray measurements on three small format compound semiconductor arrays. The devices, a 4x4 pixel GaAs array fabricated on 325 micrometers epitaxial material, a 4x4 pixel CdZnTe array fabricated on a 4X4X1 mm³ mono crystal and a 3x3 TlBr array fabricated on a 2.7 x 2.7 x 1.0 mm³ mono crystal. The pixel size for all arrays is 350x350micrometers ². Results are presented of ⁵⁵Fe and ²⁴¹Am measurements at 5.9 keV and 59.54 keV. For detector temperatures <+5 degree(s)C typical FWHM energy resolutions of 410 eV, and 600 eV at 5.9 keV and 640 eV and 1.4 keV at 59.54 keV were recorded for the GaAs, and CdZnTe arrays, respectively. Unlike the GaAs and CdZnTe arrays, the TlBr array showed a much wider variation in pixel performance and was difficult to operate with all pixels at a common bias. For example, biasing the detector so that all pixels worked within the operating envelope of the preamplifiers resulted in average energy resolutions of 20 keV at 59.54 keV. However, optimizing the operating conditions of individual pixels resulted in a marked improvement to ~2keV.

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Alan Owens, Hans Andersson, Marcos Bavdaz, G. Brammertz, Christian Erd, Thomas Gagliardi, V. Gostillo, N. Haack, I. Lisjutin, Seppo Arvo Anter Nenonen, Anthony J. Peacock, Heikki Sipila, Ivor Taylor, and Sergey Zatoloka "Development of compound semiconductor arrays for x- and gamma-ray spectroscopy", Proc. SPIE 4507, Hard X-Ray and Gamma-Ray Detector Physics III, (18 December 2001); https://doi.org/10.1117/12.450771

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