HGI2 X-RAY AND GAMMA-RAY CAMERA WITH SPECTROMETRIC CAPABILITIES

A HgI2 microstrip two-dimensional array with total area of 10 x 10 mm( 2) and a thickness of 0.5 mm has been tested. By using a coincidence-a nticoincidence technique the effective pixel area has been identified and spectroscopic performance and some indications about the spatial r esolution have been extracted. Values like 25% (FWHM) at 6 keV and 8.5 % at 32 keV for the energy resolution have been obtained. For the X-ra y energies used, ranging from 32 to 81 keV, the absence of an intense lateral diffusion of the produced charge allows performing the positio n readout in a quantized fashion, where the event position is that of the struck strip, leading to a spatial resolution corresponding to the pixel size.