Testing Tungsten Alloy in Collimator

Characterization of the microstructure was performed on metallographic sections by light microscopy. Tensile testing was carried out RT, 300 and 500°C according to DIN EN 10002 part 1 and 5 respectively. The tungsten alloy samples were taken in different orientations from 0.8 mm thick sheets. Investigations of the fracture surface of the ruptured samples by SEM gave information about the deformation machanism as function of processing route and test temperature. Tungsten alloy collimator testing was tested in comparison to conventionally produced tungsten and tungsten ally at Physikalisch-Technische Bundessanstalt.

Using sheets material of different thicknesses the change in X-ray beam intensity was measured in a test setup of ‘narrow beam’(as shown in the figure) and the liner attenuation coefficient was determined for tube voltages of 50 to 150 kV.Based on the air-kerma, which is the absorbed X-ray dose in air,the equivalent lead thickness of the different materials was calculated as a function of the tube voltage.

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