Thermo Scientific Niton Portable XRF Analyzers

Importance of the Topic

Precise and rapid analysis of precious metals is essential for the jewelry trade, recycling operations, refiners and quality‐control laboratories. Portable X-ray fluorescence (XRF) analyzers enable non-destructive testing, helping stakeholders verify karat grade, detect plating and toxic elements, and protect profitability and compliance in real time.

Objectives and Overview

This application note describes the performance and benefits of Thermo Scientific™ Niton™ portable XRF analyzers (XL2, XL3t GOLDD+, XL5 Plus handheld models and DXL desktop unit). It aims to illustrate how these instruments compare to traditional fire assay and acid scratch tests, and how they support decision-making in retail, recycling and refining environments.

Methodology and Instrumentation

Analysis is based on X‐ray fluorescence spectroscopy, where a primary X-ray beam excites atoms in the sample and secondary X-rays are measured to determine elemental composition. Key instrument features include:

• Handheld models XL2, XL3t GOLDD+ and XL5 Plus for point-and-shoot analysis
• DXL desktop analyzer with one-touch operation and sample window
• Built-in micro- and macro-cameras for precise positioning
• Optional small-spot (3 mm) for localized measurements
• Patented AuDIT™ software for gold-plating detection up to 8 µm

Key Results and Discussion

Comparative studies demonstrate excellent correlation (R²≈0.999) between Niton XRF readings and fire assay gold content across a broad range of karat grades. Analysis time is under 5 seconds per sample. The XRF method outperforms acid scratch tests by providing exact karat values, multi-element analysis (Au, Ag, Pt, Pd, common alloys and toxic elements), and non-destructive testing. Gold-plated items and counterfeit alloys are reliably identified without sample damage.

Benefits and Practical Applications

Use of portable XRF analyzers offers:

• Immediate decision support for pawn shops, jewelers, recyclers and refiners
• Enhanced profitability via accurate measurement of precious metals and avoidance of plated or counterfeit materials
• Regulatory compliance through screening for lead, cadmium and other toxins
• Higher sample throughput with minimal training and maintenance

Future Trends and Opportunities

Advances in detector sensitivity, smaller probe sizes and integration with cloud-based data management are expected. Artificial intelligence and machine learning could further improve alloy identification and predictive maintenance. Wider adoption in field inspections, remanufacturing and circular economy initiatives will drive demand.

Conclusion

Thermo Scientific Niton portable XRF analyzers deliver rapid, accurate and non-destructive precious metal analysis, outperforming traditional methods and supporting profitability, safety and regulatory compliance across diverse applications.

References

No external references were provided in the source text.