CADMIUM TUNGSTATE SCINTILLATORS OF LARGE-VOLUME

As a result of improving the process of growing CdWO4 crystals, optimi zing the scintillation light collection, and developing electronic cir cuits for amplifying and forming signals, CdWO4 scintillation detector s were created that achieve a record energy resolution of 7-8% and 10- 12% for 662 keV photons, for 10-20 and 80-150 cm(3) volumes, respectiv ely. Because of a high level of crystal purity (Th-232 content is 4 x 10(-2) mBq/kg, Ra-226 content is 5 x 10(-2) mBq/kg), it is possible to make low-background spectrometers based on these crystals for measuri ng contamination of the environment with an ultimate detection sensiti vity, e. g., 2 x 10(-13) Ci/kg for (TI)-T-208.