1 Source of Electrons

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8 Terms

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Cathode

The negative side of the x-ray tube, consisting of the filament and focusing cup.

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Filament

A small coil of wire (2mm in diameter, 1-2cm long) that emits electrons when heated.

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Thermionic Emission

Occurs when outer-shell electrons of filament atoms are "boiled off" and ejected due to high current.

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Space Charge Effect

The state where electrons hover around the filament before being accelerated, due to repulsion from one another.

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Focusing Cup

Ensures that emitted electrons are confined to focus on the anode.

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Anode

The positive side of the x-ray tube, where x-rays are produced due to the deceleration of electrons at the focal spot.

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Kilovolt-Peak (kVp)

Accelerates the electrons towards the anode.

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Distance Between Cathode and Anode

Approximately 1 cm.