Understanding XRF Detection Limits (LOD)
LOD depends on element, matrix, count time, and detector — not just the brochure number.
Detection limit (LOD) is the lowest concentration an analyzer can reliably distinguish from background.
Factors affecting LOD:
- Detector type — Premium SDD (Ultra) delivers best LOD
- Matrix — Alloy vs soil vs plastic changes sensitivity
- Count time — Longer tests improve precision
- Element — Heavy elements often easier than light elements
For critical compliance decisions, validate LOD on your matrix and confirm borderline results with lab methods.