Geometrically weighted semiconductor Frisch grid radiation spectrometers

A new detector geometry is described with relatively high gamma ray energy resolution at room temperature. The device uses the geometric weighting eff ect, the small pixel effect and the Frisch grid effect to produce high gamm a ray energy resolution The design is simple and easy to construct. The dev ice performs as a gamma ray spectrometer without the need for pulse shape r ejection or correction, and it requires only one signal output to any comme rcially available charge sensitive preamplifier. The device operates very w ell with conventional NIM electronic systems. Presently, room temperature ( 23 degrees C) energy resolutions of 2.68%; FWHM at 662 keV and 2.45% FWHM a t 1.332 MeV have been measured with a 1 cm(3) prism shaped CdZnTe device. ( C) 1999 Elsevier Science B.V. All rights reserved.