A vacuum tube that converts light into electrical energy and amplifies it. Photomultiplier tubes are used in high-end drum scanners, because they are more sensitive to light than the CCD elements used in lower-cost devices.
"photomultiplier tube." YourDictionary, n.d. Web. 12 November 2018. <https://www.yourdictionary.com/photomultiplier-tube>.
photomultiplier tube. (n.d.). Retrieved November 12th, 2018, from https://www.yourdictionary.com/photomultiplier-tube
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