Applications of Tungsten Alloy in PET Systems

Positron emission tomography (PET) is one of the nuclear medicine techniques availablefor diagnosis.Whilst X-rays provide information on the structure of the body, PET shows the chemical function of a particular organism.  PET involves the injection of FDG (aglucose-based radio nuclide) from a shielded syringe into the patient. As the FDG travels through the patient's body it emits gamma radiation, which is detected by a gamma camera, from which the chemical activity within cells and organs can be seen. Any abnormal chemical activity may be a sign that tumours are present.

Tungsten alloy is ideal for shielding against both X- and Gamma radiation. The very high density of tungsten shielding (more than 60% denser than lead) allows a reduction in the physical size of shielding components, without compromising the effectiveness of the shielding characteristics.

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