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# Multialkali ( sodium-potassium-antimony-caesium, Na-K-Sb-Cs ), also called S-20.
The multialkali photocathode has a wide spectral response from the ultraviolet to near infrared region.
It is widely used for broad-band spectrophotometers and photon counting applications.
The long wavelength response can be extended to 930 nm by a special photocathode activation processing.

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