The Thicknesses of Tungsten Heavy Alloy for Collimator

In the case of X-ray diagnostics, typical applications are collimators in the detector system and shielding parts in computer tomography. Most of these components are sheet based applications with a thickness range of about 0.1mm to 2mm. The replacement of the widely used shielding material lead (Pb) was intensified and activities on the search for substitutes have been significantly increased, the new alternative material should be tungsten heavy alloy.

Due to its high density and atomic mass, tungsten heavy alloy exhibits excellent absorption behaviour against electromagnetic radiation such as X-rays and gamma-radiation. For this reason tungsten heavy alloy materials are used for shielding applications as collimators in medical imaging diagnostics and therapy.

The fabrication of tungsten heavy alloy thin sheets with a thickness of below 1.5 mm (preferably below 0.4 mm) by tape casing technology was already reported. The near net shape produced of sheets and foils for a thickness range of below 0.1 until 4 mm was developed. In comparison to the conventional powder metallurgical fabrication of tungsten and tungsten alloy sheets for collimators, producing by pressing, sintering several rolling steps and thermal treatments, the new technology enables a nearly 100% material yield. Due to the developed technology, foil material of thickness below 0.1 and sheet material of thickness up to 3 mm can be produced .

The figure below shows tungsten heavy alloy foil and sheet material of thicknesses 0.09 to 3 mm.

 

 

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