Abstract
The spectral response of several crystals grown by the Traveling Heater Method (THM) were investigated. An energy resolution of 0.98% for a Pseudo Frisch-Grid of 4 x 4 x 9 mm(3) and 2.1% FWHM for a coplanar-grid of size 11 x 11 x 5 mm(3) were measured using Cs-137-662 keV. In addition a 4% FWHM at 122 keV has also been measured on 20 x 20 x 5 mm(3) monolithic pixellated devices. The material shows great potential toward producing large-volume detectors with spectral performance that meets the requirement for high-resolution gamma-ray spectroscopy.