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New fast, ultra low-noise UV-enhanced avalanche photodiodes (APD) were recently developed by Excelitas Technologies (formerly PerkinElmer Optoelectronics, Vaudreuil, QC, Canada). for use with scintillation crystals. The novel epitaxial type “buried junction” APD structure was designed for detecting photons with wavelengths shorter than ~600 nm at high gain with very low dark current. It typically...