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A new screen phosphor is used in the Mullard, five-inch, flying spot scanner tube type Q13-110GU. The tube has magnetic-focusing, a metal-backed screen, and a spark gap to prevent internal flashover between the anode and the grid. It operates with an anode voltage of 25kV and has a resolution better than 1000 lines. The new phosphor, a cerium activated yttrium aluminate, has an emission peak at 550nm and an extremely short decay time of less than 0.1μs. It is mixed with a blue phosphor (caesium activated yttrium silicate), which also has a short decay time. Because of the short decay time of the phosphors, the flying spot scanner tube can follow fast moving objects without blur. Mullard Ltd., Mullard House, Torrington Place, London WC1.
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