Industrial X- and gamma ray radiography
Finding a fault in a motor turbine wheel (with a diameter of 4.5cm) through X-ray tomography at the French CEA. The radiography consists of measuring the decrease in X- or gamma ray intensity passing through an object, and hence to pinpoint any structural defects. Gamma ray radiography (also known as gammagraphy), able to penetrate deeper than is possible with X-rays, can examine objects with greater detail – and is sometimes even used to scan entire trucks for drugs or explosives.