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Phototube
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<p>A phototube or photoelectric cell is a type of <a href="/facts/Gas_filled_tube/uPNhhy7I">gas-filled</a> or <a href="/facts/Vacuum_tube/VHd1BNLq">vacuum tube</a> that is sensitive to light. Such a tube is more correctly called a 'photoemissive cell' to distinguish it from <a href="/facts/Photovoltaic/5Xefaayl">photovoltaic</a> or <a href="/facts/Photoconductive/kPVR5C44">photoconductive</a> cells. Phototubes were previously more widely used but are now replaced in many applications by solid state photodetectors. The <a href="/facts/Photomultiplier_tube/bjbB9fBE">photomultiplier tube</a> is one of the most sensitive light detectors, and is still widely used in physics research. </p>