Physics 2 wk 3 exam prep

Projectile electrons travel from _____

• Anode to Cathode

• Cathode to anode

• Target to Patient

• inner shell to outer shell

During an exposure, most of the   ___   energy of the projectile electrons is converted to

• kinetic ; x-rays

• x-rays ; kinetic

• kinetic ; heat

• heat ; kinetic

At the target, the projectile electrons interact with        .

• outer-shell electrons

• inner-shell electrons

• atomic nuclei

• inner-shell and outer-shell electrons

The efficiency of x-ray production is _____ the tube current.

• indirectly proportional to

• directly proportional to

• not affected by

• strongly affected by

Most of the heat generated at the target is due to ___

• inner-shell ionization

• outer-shell excitation

• nucleus bombardment

• K x-rays

The production of heat at the anode is directly proportional to____.

• rotor speed

• filament current

• kVp

• tube current

The efficiency of x-ray production increases as _____ increases.

• mA

• kVp

• time

• mA & kVp

Approximately ____ of the kinetic energy of the projectile electrons is converted to x-rays at the target.

• 1%

• 10%

• 50%

• 99%

Electron interactions at the inner shell of the target atoms produce           radiation.

• gamma

• Bremsstrahlung

• characteristic

• alpha

The useful characteristic x-rays from tungsten targets are -shell x-rays.

• K

• L

• M

• N