Multi-Channel X-ray Fluorescence Spectrometer MXF-2400

Significance of the topic

The MXF-2400 represents a class of high-throughput, multi-channel wavelength-dispersive X-ray fluorescence (WDXRF) spectrometers designed for simultaneous quantitative determination of major and trace elements (from Be to U). Such instruments are critical in R&D and production control across metals, ceramics, glass, chemical, environmental and agricultural sectors because they enable nondestructive, rapid multi-element screening with ppm-level detection limits, strong matrix-correction capability and robust automation for routine high-volume workflows.

Objectives and overview of the instrument

The document presents the Shimadzu MXF-2400 as an upgraded multi-channel WDXRF system focused on: rapid simultaneous determination of up to 36 elements (fixed monochromators) with optional scanned qualitative/semi‑quantitative capability, improved sensitivity via a 4 kW thin-window X-ray tube, long-term stability and maintenance-minimised detectors, and advanced PC-based data processing for automated, unattended operation. It targets both major-component analysis and impurity/trace analysis in diverse sample matrices.

Methodology and measurement principle

WDXRF principle: primary X-rays excite sample atoms, producing element-specific fluorescent X-rays whose wavelengths identify elements and whose intensities scale with concentration. The MXF-2400 uses a focusing (converging) geometry with curved crystals (fixed monochromators) to concentrate characteristic lines at secondary slits, improving resolution and signal intensity. An optional scanning monochromator (flat crystal, parallel beam) is available for automated qualitative scans and FP (fundamental parameters) calculations that can quantify without standards. Matrix effects (absorption/enhancement), spectral overlaps and drift are corrected by the instrument software using polynomial calibration, internal standards, overlap/background suppression and multiple regression correction algorithms.

Used Instrumentation

• X-ray generator: end-window Rh-target tube with Be thin window, up to 50 kV/100 mA (4 kW max); fine control of tube voltage/current and stable high-voltage supply for long-term reproducibility.
• Spectrometer optics: up to 36 fixed curved-crystal monochromators (converging geometry) mounted radially around the tube; crystals include SX, TAP, PET, Ge, NaCl, LiF; LSA (multilayer converging elements) for enhanced sensitivity to superlight elements (Be, B, C, N, O, F, Na, Mg).
• Detectors: choice of sealed proportional counters (exatron/multitron with Ne/Ar/Kr fill) covering ~Na to U, flow proportional counter (FPC) for the lightest elements (B, C, O, F), scintillation counter for heavy-element detection in scanner mode; Shimadzu gas‑sealed detectors incorporate CO2 quench for stability.
• Vacuum and stabilizing systems: vacuum spectrometer environment with a microcomputer-controlled vacuum stabilizer to maintain constant vacuum during runs (improves reproducibility for light elements).
• Electronics: microprocessor-controlled pulse-counting measurement electronics with pulse-height analysis (PHA), dead-time correction and wide dynamic counting capacity (up to multi‑million cps range per channel).
• Sample handling: 8-position turret with swing-arm automated sample feeder and spinner (60 rpm), sample holders and masks for solids, filter/ion‑exchange options for liquids; rapid sample positioning (~5 s).
• Cooling and utilities: built-in distilled-water circulation cooling unit for the X-ray tube, optional external chiller (HYCOOL) for sites lacking suitable tap cooling; gas supply (PR gas Ar/CH4) for FPC when analyzing 4Be–9F; oil rotary vacuum pump for evacuation.
• Data processing: PC/AT-compatible control (Windows-based), with software for instrument control, qualitative scanning, FP quantitative mode, matrix correction, calibration curve fitting (up to 2nd order polynomial), multiple regression absorption/enhancement correction, automated reporting, LAN/RS‑232 data output and self-diagnostics.

Main results and discussion (performance highlights)

• Sensitivity and detection limits: introduction of the 4 kW thin-window tube and short tube-to-sample distance improves fluorescent intensity, yielding notable sensitivity gains—approx. 1.3× for mid/heavy elements and ≥1.7× for light elements relative to predecessors; LSA multilayer optics produce an additional ≈10× sensitivity boost for superlight elements (Be–F).
• Simultaneous multi-element capability: up to 36 channels fixed for concurrent quantitation, optional scanner enabling sequential qualitative scans and FP quantitation for many heavy elements; detection capability spans element numbers 4 (Be) to 92 (U).
• Dynamic range and linearity: advanced counting and error-correction circuits provide a wide linear dynamic range allowing a single calibration curve to span from trace ppm to major‑component concentrations and handle intensities into the multi‑million cps region.
• Precision and stability: temperature-controlled spectrometer case, vacuum stabilizer, sealed detectors and automatic core-wire winding (for gas flow counters) reduce drift and minimize maintenance. Brochure examples show repeatability (CV) typically well below 1% for many major components and precise ppm-level repeatability for trace elements in typical steel, copper-alloy and ceramic matrices when using 40 s integration times.
• Interference control: detector selection (optimized gas fill or scintillator) and the converging optics reduce spectral interferences; software overlap corrections and PHA gating further mitigate nearby-line effects.

Benefits and practical applications

• High throughput: short analysis times (example: ~2 minutes to quantify ~36 elements) and an 8-sample turret enable rapid laboratory or production-line workflows and unattended operation.
• Wide applicability: validated concentration ranges and examples for iron & steel, nonferrous metals, ceramics/cement, glass, chemical/polymers, environmental samples and agricultural matrices make it suitable for QA/QC, process control and research tasks.
• Low maintenance and long-term reliability: sealed detectors, vacuum stabilizer and automatic wire winding reduce routine maintenance and recalibration frequency—important for industrial, continuous-use environments.
• Comprehensive data handling: built-in matrix corrections, FP mode, automated qualitative matching (product classification, impurity judgement) and networked output support traceable reporting and integration with laboratory information systems.

Sample preparation and optional accessories

Sample preparation accessories described include vibration mills (for powders), briquet presses and rings, polishing machines, glass-bead fusion and filter/ion-exchange options for liquids. Proper preparation (grinding, briquetting, fusion or filter deposition) reduces grain‑size effects and matrix heterogeneity, improving quantitation. Cooling-water circulation units and appropriate sample holders/masks are specified for routine operation.

Installation and operational requirements

• Electrical: main unit typically requires single-phase 200/220 V, up to ~60 A peak depending on configuration; data processing unit may use separate single-phase 100 V supply.
• Cooling: distilled water reservoir (18 L) with external cooling water loop or optional external chiller; flow and temperature requirements specified for stable tube cooling.
• Vacuum and gas: oil rotary vacuum pump and PR gas (Ar/CH4) supply for FPC if light-element analysis is used.
• Physical: main unit footprint approx. 1.13 m ×1.16 m ×1.67 m, weight ~600 kg; access and room clearance requirements plus site grounding (≤30 ohm) and ambient control (18–28 °C, humidity ≤70%).

Future trends and potential uses

• Detector and optics advances: continued development of multilayer optics and solid-state detectors may further improve light-element sensitivity and energy resolution while reducing vacuum/gas complexity.
• Automation and inline deployment: integration with automated sample feeders, robotic loaders and process lines will broaden real-time process control applications in metallurgical and cement plants.
• Software and AI: enhanced spectral deconvolution, automated matrix recognition, machine‑learning assisted calibration transfer and predictive maintenance will reduce operator burden and increase uptime.
• Miniaturization and portability: while the MXF-2400 is a bench‑top production instrument, trends toward compact, lower-power WDXRF and improved handheld/benchtop ED-XRF hybrids may complement high-end WDXRF for field screening.

Conclusion

The MXF-2400 is a robust, high-performance multi-channel WDXRF system optimized for fast, simultaneous multi-element analysis across a wide elemental range (Be–U). Its strengths are enhanced sensitivity (especially for light and superlight elements), extensive channel capacity for concurrent quantification, strong automation and data-processing features, and engineering choices that prioritize long-term stability and low maintenance. These attributes make it well suited for industrial QA/QC, production control and research environments that require reliable, repeatable multi-element analyses at trace-to-major concentration ranges.

References

• Shimadzu Corporation. MXF-2400 Multi-Channel X-ray Fluorescence Spectrometer — Product brochure and specifications. First edition May 2002; company publication updated 2026.