Prof. Lobel Practice CH9

1. What are the three essential conditions for the production of x-rays?

• High temperature, high voltage, target material

• Low temperature, low voltage, vacuum

• Radiation source, electron beam, filter

• High pressure, low density, target material

1. What is the source of free electrons?

• Copper

• Tungsten filament

• Air

• Anode

1. When heated, what is produced?

• Photons

• Electrons

• Heat

• Neutrons

1. What is the space charge effect?

• Increased electron density

• Decreased voltage

• Reduced radiation output

• Heat generation

1. The number of electrons is predetermined by what?

• Filament size

• Voltage applied

• Current supplied

• Target material

1. How does the acceleration of electrons of the space charge move towards the anode?

• By gravity

• Due to magnetic fields

• By electric potential difference

• By thermal conduction

1. What Law is used by the anode disc?

• Ohm's Law

• Faraday's Law

• Law of Conservation of Energy

• Newton's Law

1. What is the Law of Conservation of Energy in the context of X-ray tubes?

• Energy cannot be created or destroyed

• Energy is lost as heat

• Energy is increased during exposure

• Energy is transformed to light

1. What percent of radiation is emitted to produce effective use for diagnostic x-rays?

• 10%

• 25%

• 1%

• 50%

1. What percent is emitted from the x-ray tube and its housing as wasted heat?

• 90%

• 75%

• 99%

• 50%