The β-ray backscattering method is a more precise non-destructive thickness measurement method. Its working principle is to use radioactive isotopes (such as E-Pml47, etc.) to release β-rays. The β-rays entering the metal are reflected to the Detector, and the intensity of the reflected β-particles is a function of the type and thickness of the coating to be tested. Therefore, measuring the intensity of the β-rays reflected by the coating to be tested from the Detector can be measured This method is especially suitable for measuring the thickness of various precious metal coatings; it can also measure thin layers (below 2.5 µm) of non-metallic coatings on metal or non-metallic substrates, due to β The ray Thickness Gauge itself is only a comparative instrument for measuring the reflection intensity of β-rays. Its thickness value scale is obtained through the calibration of standard samples. If the coating composition, density, substrate type and surface of the tested sample and the standard sample When there is a difference in curvature, the thickness reading should be corrected according to the following formula:
The operation method of the thickness measurement of the β-ray instrument can be carried out according to the instruction of the instrument, because various radioactive sources are used in the thickness measurement, which is harmful to human health, and it is necessary to strictly follow the regulations and pay attention to the protective measures during operation.
