The Niton Model XL2 analyzer contains an x-ray tube which emits radiation only when the user turns the x-ray tube on. When the x-ray tube is on and the shutter is open, as during a measurement, the analyzer emits a directed radiation beam - see Figures 1-1 and 1-2. Sealed against moisture and dust with 100% embedded software tools, these. Thermo Fisher Scientific Inc. makes no representations that this document is complete, accurate or errorfree and assumes no responsibility and will not be liable for any errors, omissions, damage or loss that might result from any use of this document, even if the information in the document is. The Thermo Fisher Scientific XL2 handheld XRF analyzer is a leading device widely used in fields like metal inspection, mining, recycling, alloy separation, and consumer goods quality control. This article will help you better understand this device, from its concept and operating principles to. The mobile Niton™ XL2 plus is designed for fast, non-destructive elemental analysis directly on site. In addition to the element range Cl - U, the handheld instrument also analyzes the lighter elements Al, Mg, P, S and Si with its SD detector.