In the recent years, portable X-ray fluorescence spectrometry equipment has become increasingly popular as an exploration tool for analysis of a wide range of materials in alloy analysis, scrap metal dealing, , the precious metals industry, toy industry, archaeology and mining.
The portable XRF operates at 50 kV, and 0.1 mA, using a miniaturised x-ray tube, and is fitted with multiple filters to provide optimum x-ray detection. A high-performance thermoelectrically cooled detector with real-time digital signal processor and dual embedded processors compute and store the data for transfer to PC. The Niton Model XL3t emits radiation only when the user turns the x-ray tube on. When shutter is open, as during a measurement, the analyser emits a directed radiation beam in front of the nose. Reasonable effort should be made to maintain exposures to radiation as far below dose limits as is practical. This is known as the ALARA (As Low as Reasonably Achievable) principle.
In-house developed methodology allows XL3t detect up to 30 elements with comparable quality to ED-XRF with up to 15 certified values by standard reference materials. Using this standard data it is possible to correct for instrument drift and control its stability through the all analysis. Good accuracy and data precision shown on c.14 elements is < 5%. On some trace elements it will be litho type dependent. However, the best results are achieved by set up method of analysing pellets and powders still a viable data can be determined on core samples with as little preparation as measuring the analysis points placed on the core. One of the restrictions in use portable device is its limitations for Na and Mg detection. Magnesium data cannot be determined below 1-2%. Whereas sodium detection by this technique is not possible at all but concentrations can readily be modelled from the HHXRF Al data using linear regression equations derived from ICP data.