An alumina-silica glass cylinder with cerium-activated gadolinium bromide, 2.5 cm in
diameter and 3 cm long was cast to form a scintillation detector for spectral analysis of
nuclear radiation, especially gamma rays. The detector, operated with a conventional
photomultiplier tube and associated power supply, amplifier, and multichannel analyzer,
shows for the first time for this material system a set of spectra that include well-defined full-
energy gamma-ray peaks from 59.5 keV to 2500 keV. The full-energy peaks were …