How can XRF be used to measure coating thickness?

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Multiple Choice

How can XRF be used to measure coating thickness?

XRF can determine coating thickness by looking at how the coating alters the X-ray signals coming from the coating itself and from the substrate. The coating adds its own fluorescence, but those emitted X-rays must pass through the coating material to reach the detector, and the substrate’s fluorescence is attenuated as it travels through the coating. By measuring the coating’s signal relative to the substrate’s signal and applying thickness-related models (such as fundamental-parameter calibration) or using dual-energy XRF methods to separate the coating and substrate contributions, you can solve for how thick the coating is. This relies on how intensity changes with thickness and known material properties, not on weighing the sample or just counting photons.

XRF can determine coating thickness by looking at how the coating alters the X-ray signals coming from the coating itself and from the substrate. The coating adds its own fluorescence, but those emitted X-rays must pass through the coating material to reach the detector, and the substrate’s fluorescence is attenuated as it travels through the coating. By measuring the coating’s signal relative to the substrate’s signal and applying thickness-related models (such as fundamental-parameter calibration) or using dual-energy XRF methods to separate the coating and substrate contributions, you can solve for how thick the coating is. This relies on how intensity changes with thickness and known material properties, not on weighing the sample or just counting photons.

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