is a bright (200 times of PWO), fast (40 ns) and radiation hard crystal scintillator. The light output loss of 20 to 28 cm long crystals is at a level of 10% after 1 Mrad -ray irradiations, much better than all other crystal scintillators.  The material is widely used in the medical industry. Existing mass production capability would help in crystal cost control.  LSO/LYSO crystals are chosen by the Mu2e and SuperB experiments to construct electromagnetic calorimeters with total absorption nature. They are also proposed as the active material for sampling calorimeter options for the CMS forward calorimeter upgrade.

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