The question whether the energy resolution of inorganic-scintillator gamma-
ray detectors can be improved, particularly at gamma-ray energies above sim
ilar to 300 keV is addressed. Experimental results presented on the new sci
ntillators LaCl3 : Ce and LaBr3 : Ce demonstrate that the answer is confirm
atory. At 662 keV, energy resolutions of respectively, 3.1% and 3.0%, were
observed. (C) 2001 Elsevier Science Ltd. All rights reserved.