MXF-2400 - Shimadzu do Brasil Comércio

Principle & ConstructionPrinciple & ConstructionPrincipleWhen X-rays hit a sample, atoms in the sample are excited and release the secondary X-rays, which are alsocalled fluorescent X-rays. Since the wavelength of secondary X-rays is peculiar to the element concerned, thesample can be qualitatively determined by measuring that wavelength. Also, since the fluorescent X-ray intensity isproportional to the concentration of the element, quantitative determination is made by measuring the fluorescentX-ray intensity of the wavelength peculiar to each element.Spectrometer UnitThis unit disperses the fluorescent X-rays generated fromthe sample, measures the intensity of the X-rays of theparticular wavelength, and converts that intensity intoelectric signals. High quality curved crystals are used forDetectorX-ray tubeFocusing circledispersion.The MXF-2400 uses one monochromator for one element,Secondary slitDetectorSecondary slitand up to 36 monochromators can be installed together topermit simultaneous determination of up to 36 elements.2θ2Use of the optional scanning monochromator providesautomatic qualitative analysis and allows up to 30 elements toCurved crystalCurved crystalbe preset for quantitative analysis.Concentration (%)Si 3.1182Mn 0.2011P 0.0209SMg0.01730.0185Primary slitIntensitySampleConcentrationcalculationConcentrationPrimary slitX-ray intensity (kcps)SiMnPSMg34.797256.305880.458811.119120.11576Measuring ElectronicsThe electric pulses corresponding to the number of X-rayphotons are counted and recorded. — The output pulse signalof the detector is amplified and its interfering spectrum signalsare removed by the pulse height analyzer. Then the signal ismeasured by the scaler, processed by the microprocessor,and then transmitted to the data processing unit.X-ray Power SourceThis unit supplies power to the X-ray tube which emits theX-ray power sourceSpectrometerunitMonochrometerX-ray tubeDetectorAmplifierMeasuring electronicsPHA scalerMicroprocessorData processing unitDisplayPrinterKeyboardexcitation X-rays (primary X-rays). It consists of a highvoltagetransformer and an X-ray power controller.Data Processing UnitX-ray intensities are converted into concentration values ofthe elements concerned through the use of the conversionequations (calibration curves) predetermined using standardsamples. The results are presented on the display or theprinter.4