Rad135 Ch5 The X-Ray Tube Question Preview (ID: 55304)


This Content Covers Chapter 5 (The X-Ray Tube) From The Text To Help You Prepare For The Midterm Exam In Rad135. TEACHERS: click here for quick copy question ID numbers.

How many heat units are created by an exposure of 75 kVp, 200 mA, and 0.25 sec on a high-frequency rectified unit?
a) 3,255 HU
b) 5,250 HU
c) 7,375 HU
d) 9,375 HU

Which of the following extends tube life?
a) activating the high-speed rotor whenever possible
b) avoid making repeated exposures near the tube loading limits
c) utilizing a higher mA station with long exposure times whenever possible
d) rotating the tube housing 90* before the rotor has come to a stop

Which of the following is the only part of the x-ray tube assembly that is outside the vacuum of the glass envelope?
a) filament
b) focusing cup
c) stator
d) rotor

Which of the following is the limit to leakage radiation?
a) 100 mR/hr at 1m
b) 100 rad/hr at 1m
c) 150 mR/hr at 1m
d) 100mR/min at 1m

What type of radiation is made of photons that were not produced at the focal spot?
a) leakage
b) off-focus
c) scatter
d) secondary

What is the most common target angle used in diagnostic radiography?
a) 8*
b) 10*
c) 12*
d) 45*

Which of the following is NOT a reason for tungsten to be the metal of choice for the anode?
a) high atomic number
b) high melting point
c) greater elasticity
d) heat-conducting capability

What is the shallow depression called which is located in the cathode assembly?
a) focusing cup
b) filament
c) focal spot
d) dual focus

Production of x-rays requires...
a) rotor, stator, low temperatures
b) source of electrons, target, low voltage, vacuum
c) source of electrons, target, high voltage, vacuum
d) stationary anode, grid-biased tube, and high mA

The cathode...
a) has a positive charge
b) has a negative charge
c) rotates on a molybdenum base
d) is electromagnetically induced by the stator

Which side of the x-ray tube is negatively charged?
a) anode
b) cathode
c) rotor
d) stator

What happens to the filament as vaporization continues?
a) melts
b) becomes thinner
c) becomes thicker
d) becomes cooler

What does thermionic emission do to free electrons?
a) causes them to be slowed down
b) hugs them in a warm blanket
c) causes them to be released from the filament
d) blocks them

What is the minimum temperature a tungsten filament needs to exhibit significant thermionic emission?
a) 1,500 C
b) 2,200 C
c) 500 C
d) 3000 C

Which is true regarding tube failure?
a) the tungsten filament gets thicker over time from build-up
b) vaporized tungsten does not stick to the glass envelope
c) arcing improves image detail
d) exposing a cold anode could crack it

Which is not synonymous with the term target area?
a) actual focal spot
b) focal track
c) focal point
d) effective focal spot

According to the anode heel effect...
a) intensity of the beam is greater on the cathode side
b) intensity of the beam is less on the cathode side
c) always place the patient's heel on the tube housing during cross-table imaging
d) you never need 72 in SID when utilizing the anode heel effect

Which would NOT affect rotation of the anode target?
a) failure of the silver ball bearings
b) failure of the rotor
c) failure of the filament circuit
d) failure of the stator

Which is NOT true of the tube housing?
a) It is lead-lined to control leakage radiation
b) It is grounded to isolate the high voltage
c) It is filled with dielectric oil to promote cooling
d) It is recommended to place your hand on the housing during exposure to ensure it is cool enough

Tube rating charts and cooling charts...
a) are universal for all diagnostic x-ray tubes
b) can give guidance for safe exposure parameters
c) are only for mammography units
d) should be consulted before every exposure

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