Precision crystal calorimetry in future high energy colliders

Precision crystal calorimetry in future high energy physics experiments faces a new challenge to maintain its precision in a hostile radiation environment. This paper reviews the radiation hardness requirements to the crystal scintillators and approaches to develop high quality scintillating crystals. Two on-going efforts are discussed in detail: the CsI(Tl) crystal development for the BaBar experiment at SLAC and the progress of the PbWO/sub 4/ crystal quality for the CMS experiment at LHC.