Results on new scintillating crystals from the `Crystal Clear´ collaboration

The author discusses an effort undertaken by 14 research institutes (the Crystal Clear collaboration, CERN, RD project 18) to develop and investigate new dense, radiation-hard, and fast inorganic scintillators suitable for very-good-resolution electromagnetic calorimeters to be built at the new high-luminosity accelerators. Other fields of interest like nuclear physics, gamma ray astronomy, medical imaging (positron emission tomography), safety systems, and nondestructive industrial applications are also rapidly growing. Recent results on the most promising candidates are given with some comments on mass production and cost considerations. Emphasis is placed on recent results on cerium fluoride, which is presently considered as the most promising candidate