photometry

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photometer In a reflected-light microscope, an attachment which is used to measure the reflectance of ore minerals. It consists of a photomultiplier tube that has high sensitivity throughout the visible spectrum. It is used in conjunction with a stabilized light source and high quality monochromators; its readings conform to Commission on Ore Microscopy (COM) standards.

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photometry A general term for the physical measurement of the ultraviolet, visible, and infrared portions of the electromagnetic spectrum.