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An Approach to Sub-Pixel Spatial Resolution in Room Temperature X-Ray Detector Arrays with Good Energy Resolution

  • W. K. Warburton (a1)

Abstract

In this paper we examine a recently proposed concept for obtaining sub-pixel spatial resolution in compound semiconductors where hole transport properties are relatively poor. [1] This approach uses weighted sums and differences of local pixel signals to extract both accurate x-ray energy estimates and interpolate location at the sub-pixel level. A simple analysis, including noise estimates, suggests the possibility of obtaining locations at the 50–100 micron level using 1–2 mm wide stripe electrodes while obtaining 1–2% energy resolution for x-rays up to 100 keV. Following this examination, we will present the most recent experimental results from our program to develop electronics to implement this scheme.

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1. Warburton, W. K. in “Fifth Scientific Symposium on Room-Temperature Semi-Conductor X-ray, Gamma-ray, and Neutron Detectors, (11–12 March 1997, Sandia National Laboratory, Livermore, CA), Ed. James, R. B..
2. Barber, H B, SPIE Vol. 2859, p.2628 (1996).
3. Hamel, L A, Macri, J R, Stahle, C M, Odom, J., Birsa, F., Shu, P. & Doty, FP, IEEE Trans. Nucl. Sci. 43, p. 14221426 (1996).
4. Marks, D G, Barber, H B, Dereniak, E L, Eskin, J D, Matherson, K J, Woolfenden, J M, Young, E T, Augustine, F L, Hamilton, W J, Venzon, J E, Apotovsky, B A & Doty, F P, IEEE Trans. Nucl. Sci. 43, p. 12531259 (1996).
5. Eskin, J D, Barrett, H H, Barber, H B & Woolfenden, J M, IEEE 1995 Nuclear Science Symposium and Medical Imaging Conference Record, P.A. Moonier Ed., p. 544–548 (1995).

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