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, the imaging of partly opaque objects with penetrating radiation.

In contrast to other sources of ionizing radiation, X-rays are only produced as long as the X-ray tube is energized.

X-ray tubes are also used.

CT scanners, airport luggage scanners, X-ray crystallography, material and structure analysis, and for industrial inspection.

Increasing demand for high-performance, computed tomography (CT) scanning and angiography systems has driven development of very high performance medical X-ray tubes.

Coolidge X-ray tube, from around 1917.

The heated cathode is on the left, and the anode is right.

The X-rays are emitted downwards.

Contents, history edit, x-ray tubes evolved from experimental.

Crookes tubes with which X-rays were first discovered on November 8, 1895, by the German physicist.

These first generation cold cathode or, crookes, x-ray tubes were used until the.

Crookes tube was improved by, william Coolidge in 1913.

2, the, coolidge tube, also called hot cathode tube, is the most widely used.

It works with a very good quality vacuum (about 104 Pa, or 106 Torr).

Citation needed, until the late 1980s, X-ray generators were merely high-voltage, AC to DC variable power supplies.

In the late 1980s a different method of control was emerging, called high speed switching.

This followed the electronics technology of switching power supplies (aka switch mode power supply and allowed for more accurate control of the X-ray unit, higher quality results, and reduced X-ray exposures.

Citation needed Physics edit Spectrum of the X-rays emitted by an X-ray tube with a rhodium target, operated at.

The smooth, continuous curve is due to bremsstrahlung, and the spikes are characteristic K lines for rhodium atoms.

As with any vacuum tube, there is a cathode, which emits electrons into the vacuum and an anode to collect the electrons, thus establishing a flow of electrical current, known as the beam, through the tube.
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