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X-ray fluorescence (XRF) is the emission of characteristic "secondary" (or fluorescent) X-rays from a material that has been excited by being bombarded with high-energy X-rays or gamma rays.The phenomenon is widely used for elemental analysis and chemical analysis, particularly in the investigation of metals, glass, ceramics and building materials, and for …Processing generally results in a change in the nature, shape, or form of materials. ... gas, or mineral deposits are removed from their natural underground reservoirs. Example: Drilling a well to remove natural gas from the ground is an extracting operation. ... Computer equipment used in collateral or administrative functions (such as ...
