The Research And Development Of Low-Z Elements EDXRF Analyzer

Having been droved by the successive improvement and development of XRF spectrometer, XRF(X-Ray Fluorescence) Spectrometry is widely used in many departments and fields, such as metallurgy, geology, minerals, petroleum, chemical, medical, criminal investigation, archaeological and so on. From the key technical points of low-Z elements energy X-ray fluorescence Spectrometry such as detector, MCA, stable high power, database of standard samples, processing of the spectrum, design of system software and research of the whole instrument, the researches were carried on deeply according to the shortages of the technique of X-ray fluorescence Spectrometry existed. And the researches figured as support of "Five-Year Plan" Geological Survey scientific project of Ministry of Land and Resources, references of the key technique of X-ray fluorescence Spectrometry existed and intervening of information technique, micro-electronics technique and digital signal processing technique.The performances of EDXRF analyzer are mainly influenced by the stability and energy resolution of X-ray detector, the stability of X-ray generator and the geometric relationship of location of the Source-Sample-Detector in X-ray spectrometer. The research scheme used thermoelectrically cooled Si-PIN X-ray detector and took X-ray tube as the source of X-ray, which can effectively avoid the pollution of isotope excitation source to environment. Vacuum measurement system was designed to significantly improve the detecting efficiency of analytical instrument for low-Z elements. The MCA was developed in this paper. It was consist of the soul part of ARM7 MCU and the communication means by Ethernet, and had many features, such as low-power, high-SNR, excellent stability, high-speed data exchange, etc. Multi-channel spectrum processing software also was designed, which can recognizes characteristic peaks effectively and possesses functions of calibration, analysis and test of stability, etc. The automatically classification analysis of sample was implemented by Pattern-Recognition technique. At the same time, the software on Linux platform was developed for more safe and stable field.Low-Z elements Energy-XRF spectrometer, adopting electric refrigeration semiconductor detector, can be used in industrial or open field. It can reached the performances of indoor (Si)Li semiconductor detector. Micro X-ray tube was applied in this spectrometer and spectrum processing technology was mature, so in the condition of scene or experimental laboratory, this instrument can meets the need of analysis and measurement in many aspects, such as bulk, weight and analytical accuracy. With the development of exploiting minerals and oil gas, and the increasing request of world environment protection, this type of instrument may plays an important role in the area of mineral and oil exploration, mineral separating, smelt metal and detecting noxious constituent of manufactured products, and brings in huge economic benefit and social benefit yet.