Photoemission diode standards for accurately measuring monochromatic ultraviolet light intensity (3000 Å-11OO Å) are described that are also blind to visible ligh (λ> 3600 Å). The standard uses an opaque photocathode of Cs2Te and is unique because of its combination of thinness (19 mm), high sensitivity (Q.E. > 10%), time stability, and uniformity of response. Design criteria, construction methods, and difficulties overcome in obtaining a stable, unform, high yield photocathode responses are discussed. Cs2Te is discussed in terms of a model for high yield photoemitters.
G. B. Fisher, W. E. Spicer, P. C. McKernan, V. F. Pereskok, and S. J. Wanner, "A Standlard for Ultraviolet Radiation," Appl. Opt. 12, 799-804 (1973)