Page "Photocathode" Paragraph 3
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# Ag-O-Cs, also called S-1.
This was the first compound photocathode material, developed in 1929.
Sensitivity from 300 nm to 1200 nm.
Since Ag-O-Cs has a higher dark current than more modern materials photomultiplier tubes with this photocathode material are nowadays used only in the infrared region with cooling.
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