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Gamma-ray measurements during deuterium-tritium cam paigns require detectors characterized by a good energy resolution, a relati v ly high detection efficiency for a few MeV gamma-rays and a fast response time. Scintillat ors proposed for monitoring gammarays in high temperature plasma experiments fulfill most of these requirements, in addition they are rather resistant to neutron damage in comp arison to, e.g., germanium detectors. Intense fast neutron fluxes expected during DT camp aigns reduce considered materials to oxygen-free crystals. CeBr3 scintillators were investigated with the aim to us e them for gamma-ray diagnostics of fusion plasma. Basic properties like ght output, energy resolution, decay time and full energy peak detection efficiency were m asured using a spectrometry photomultiplier. The response of CeBr 3 was studied as a function of crystal volume between 0.5 and 350 cc. A comparison with well-know and used as reference alkali halide scintillators is presented.  Measurements were performed at the National Centre for Nuclear Research (NCBJ) using gamma-ray sources with energies up to a few M eV, in particular PuBe and PuC gamma emitters. Natural background radiation spectra allowed to est imate the intrinsic activity of CeBr3 and LaBr 3:Ce scintillators.

Scintillators For High-Temperature Plasma Diagnostics