RAD 231: Module 2

All of the following are related except one. Select the choice that is NOT RELATED.

• a source of electrons

• a vacuum

• thermionic emission

• a large potential difference

The function of the cathode is to produce

• a focal point

• an electrical connection to the rectifier

• a thermionic cloud

• a grounding effect

All of the following are part of the cathode assembly EXCEPT

• filament

• stator

• focusing cup

• associated wiring

All of the following are preferred cathode filament materials EXCEPT

• copper

• tungsten

• rhenium

• molybdenum

Filament materials are chosen primarily for their

• atomic number

• high melting points

• ability to vaporize easily

• voltage tolerance

Which of the following would affect the production of a thermionic cloud?

• filament diameter

• filament length

• filament temperature

• all of the above

The cathode focusing cup has a/an ____ charge.

• neutral

• isometric

• positive

• negative

As more and more electrons build up in the area of the filament, their negative charges oppose the emission of additional electrons. This phenomenon is known as

• thermionic emission

• biased cloud formation

• space charge effect

• current saturation

X-ray photon production occurs at the

• anode

• cathode

• filament

• stator windings

Cracking of the anode typically occurs

• with extended use

• when the anode is off-focus

• when a cold anode is hit with a high kVp exposure

• when the cathode cup touches the anode, causing a short