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We have constructed a new ultrav iolet (U V) radiom etry facility at the Synchrotron Ultraviolet Radiation Facility (SURF II) at the National Institute of Standards and Technology (N IST). The facility combines a high-throu ghput norm al-in cidence monochrom ator with an absolute cryogenic radiom eter (A CR) optim ized for UV m easurem ents to provide absolute detector-based radiom etric calibratio ns in the spectral range 125 nm to approxim ately 320 nm. The system can be con® gured fordoi:10.1088/0026-1394/35/4/15 fatcat:wr5bnts4xvamfln5mdljhdgt6m