RE: Third hole RNS19 Dec 2025 09:38
i am woefully unenquipped to know whether pxrf is accurate or not, but this was the output from tinterweb;
xrf accuracy is generally very high for metals (often within 0.1-0.5% for gold/alloys) but depends on factors like sample ****geneity, element atomic number (heavier is better), and measurement time; it's excellent for alloy verification but needs calibration and careful technique (like averaging multiple spots) to overcome surface plating issues or low concentration limits, especially for lighter elements or trace analysis.
key factors influencing accuracy
sample type: high accuracy for solid metals (gold, steel), less for minerals/plastics unless calibrated.
element z (atomic number): heavier elements (higher z) are generally more accurate than lighter ones.
measurement time: longer times improve precision and sensitivity, crucial for trace elements (ppm levels).
sample preparation: flat, smooth surfaces and low particle size in powders yield better results; inconsistent samples (e.g., gold-filled items) need caution.
calibration: essential for accurate results; standardizing with known samples improves performance.
accuracy in practice
precious metals: very reliable for purity checks (e.g., 99.9% accurate for gold), often within 0.1-0.2% of fire assay.
trace elements: can detect ppm levels, but requires longer times and good sample prep; very sensitive to contamination.
plated items: measures only the surface; requires specialized coating thickness analysis or secondary testing to check underlying material.
improving accuracy
averaging: test multiple spots on non-****geneous samples.
longer measurement: increases counts for better precision.
calibration: apply material-specific calibrations.
detector choice: higher-end detectors (like sdd) improve count rates and precision.
in essence, xrf is a powerful, non-destructive tool, but its accuracy hinges on understanding its principles and tailoring the technique to the specific material and elements being analyzed.
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