Thickness Gauging / Radioisotope Gauging

Gamma Backscatter Thickness Technique

The intensity of backscattered radiation from the sample is measured to give a sample thickness or mean atomic number. Used for the measurement of substances of low atomic number for which measurements are sufficiently sensitive.

Thickness Gauging Applications

Measurement of light alloys, glass, plastics, rubber for which beta sources are not suitable, (e.g. greater than 500mg/cm²), access only available from one side, (e.g. tube wall thickness gauging).

Measurement Range

Sources:

• Americium-241 (Am-241)
• Cesium-137 (Cs-137)

Thickness / Mass / Flow Gauging

QSA is a global supplier of high-precision radiation sources used in radioisotope gauging applications such as thickness, mass, and flow gauging.  

Transmission Thickness / Mass Flow Technique

The source and the detector are placed on opposite sides of the material to be measured. Gamma or beta radiation transmitted through the sample is then directed related to the sample thickness, provided the density of the material is constant.

Applications

Gamma Gauging

• Thickness gauging of sheet metal, glass, plastic, and rubber at thicknesses greater than 500 mg/cm²
• Belt weighting, giving mass (kg/m²) flowing on conveyor belt.
• Non contact measurement and control of liquids, solids, or slurries in pipelines

Thickness / Mass / Flow Gauging Sources:

• Cobalt-60 (Co-60)
• Cesium-137 (Cs-137)
• Americium/Beryllium (AmBe)
• Americium-241 (Am-241)