Beta-backscatter Measuring Method

Beta-backscatter measuring method acc. to the standards DIN EN ISO 3543, ASTM B567a.

Schematic diagram of the Beta-backscatter measuring method.
Schematic diagram of the Beta-backscatter measuring method.

Functional principle

An isotope source emits beta radiation (electrons). These penetrate the surface of the coated workpiece and interact with the atoms of the coating and substrate material. The measurement effect consists of the number of backscattered electronics that are detected with a Geiger-Müller counter tube. The coating thickness can be determined with this method when the atomic numbers  Z of the coating and substrate material differ by at least Z = 5.

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