RAD 121 UNIT 1 EXAM QUESTIONS AND
ANSWERS 100% CORRECT
Molybdenum - ANSWER-what do specialized tubes for mammography use for the
primary target material
target - ANSWER-what is considered the point source of x-ray photons
1 heat unit - ANSWER-what is equal to 0.78 joules
to provide sufficient resistance to the flow of electrons to cause thermionic emission -
ANSWER-what is the function of the filament
tungsten - ANSWER-what materiel, because of its high melting point and difficulty
vaporizing, is the material of choice for the filament
rotor - ANSWER-what part of the anode assembly is composed of hollow copper
cylinder or cuff
effective focal spot - ANSWER-what term is used to describe the area of the focal spot
that is projected out of the tube toward the object being radiographed
rotating - ANSWER-what type of anode is utilized in most diagnostic radiography units
because of its greater efficiency
tube-rating chart - ANSWER-what type of charts are the most valuable because they
proved a guide regarding the maximum technical factor combinations that can be used
without overloading the tube
William Coolidge - ANSWER-who developed the first hot filament tube for the General
Electric Corporation in 1913
added - ANSWER-any filtration that occurs outside the tube and housing and before the
image receptor is considered ___________
filter - ANSWER-any material designed to selectively absorb photons from the x-ray
beam is called a ________
braking - ANSWER-Bremstrahlung interactions are named for the German word for
__________ or slowing
Thoreaus - ANSWER-____________ filters are used in radiation therapy
, total - ANSWER-_______________ filtration is equal to the sum of inherent and added
filtration
amplitude - ANSWER-when mA, time, or mAs is changed, the result is a change in the
__________ of the emission graph
true - ANSWER-true or false: a common cause of tube failure is bad bearings caused
by long use at high temperatures
false - ANSWER-true or false: as generator phasing efficiency increases, the x-ray
beam decreases in intensity
Bremsstrahlung - ANSWER-in the diagnostic x-ray range, most photons are produce by
____________ target interactions
ionization - ANSWER-occurs when the incident electron has enough energy to knock an
inner-shell electron from orbit
characteristic - ANSWER-___________ photons can be created by incident electron
ionization of any electron shell
nucleus - ANSWER-the amount of kinetic energy lost by incident electrons in a Brems
intereaction is determined by the distance the electron is from the ___________
1 mm Al/Eq - ANSWER-the collimator device adds approximately _________ to the
beam
sun - ANSWER-the science of x-ray spectroscopy uses measurements of photon
energies to determine what type of atoms make up the ______ and stars
kinetic - ANSWER-the target interaction that produces the x-ray photon consist of less
than 1 percent of the total _________ energy of the incident electrons
half-value layer - ANSWER-the ___________ is the amount of absorbing material that
will reduce the intensity of the primary beam to one-half its original value
aluminum - ANSWER-what is the most commonly used filter material
filtration - ANSWER-what process is the elimination of low-energy x-ray photons by
insertion of absorbing materials into the primary beam
compensating filters - ANSWER-what type of filter is designed to solve a problem
involving unequal subject densities
compound - ANSWER-what type of filter uses two or more materials that complement
one another in their absorbing abilities
ANSWERS 100% CORRECT
Molybdenum - ANSWER-what do specialized tubes for mammography use for the
primary target material
target - ANSWER-what is considered the point source of x-ray photons
1 heat unit - ANSWER-what is equal to 0.78 joules
to provide sufficient resistance to the flow of electrons to cause thermionic emission -
ANSWER-what is the function of the filament
tungsten - ANSWER-what materiel, because of its high melting point and difficulty
vaporizing, is the material of choice for the filament
rotor - ANSWER-what part of the anode assembly is composed of hollow copper
cylinder or cuff
effective focal spot - ANSWER-what term is used to describe the area of the focal spot
that is projected out of the tube toward the object being radiographed
rotating - ANSWER-what type of anode is utilized in most diagnostic radiography units
because of its greater efficiency
tube-rating chart - ANSWER-what type of charts are the most valuable because they
proved a guide regarding the maximum technical factor combinations that can be used
without overloading the tube
William Coolidge - ANSWER-who developed the first hot filament tube for the General
Electric Corporation in 1913
added - ANSWER-any filtration that occurs outside the tube and housing and before the
image receptor is considered ___________
filter - ANSWER-any material designed to selectively absorb photons from the x-ray
beam is called a ________
braking - ANSWER-Bremstrahlung interactions are named for the German word for
__________ or slowing
Thoreaus - ANSWER-____________ filters are used in radiation therapy
, total - ANSWER-_______________ filtration is equal to the sum of inherent and added
filtration
amplitude - ANSWER-when mA, time, or mAs is changed, the result is a change in the
__________ of the emission graph
true - ANSWER-true or false: a common cause of tube failure is bad bearings caused
by long use at high temperatures
false - ANSWER-true or false: as generator phasing efficiency increases, the x-ray
beam decreases in intensity
Bremsstrahlung - ANSWER-in the diagnostic x-ray range, most photons are produce by
____________ target interactions
ionization - ANSWER-occurs when the incident electron has enough energy to knock an
inner-shell electron from orbit
characteristic - ANSWER-___________ photons can be created by incident electron
ionization of any electron shell
nucleus - ANSWER-the amount of kinetic energy lost by incident electrons in a Brems
intereaction is determined by the distance the electron is from the ___________
1 mm Al/Eq - ANSWER-the collimator device adds approximately _________ to the
beam
sun - ANSWER-the science of x-ray spectroscopy uses measurements of photon
energies to determine what type of atoms make up the ______ and stars
kinetic - ANSWER-the target interaction that produces the x-ray photon consist of less
than 1 percent of the total _________ energy of the incident electrons
half-value layer - ANSWER-the ___________ is the amount of absorbing material that
will reduce the intensity of the primary beam to one-half its original value
aluminum - ANSWER-what is the most commonly used filter material
filtration - ANSWER-what process is the elimination of low-energy x-ray photons by
insertion of absorbing materials into the primary beam
compensating filters - ANSWER-what type of filter is designed to solve a problem
involving unequal subject densities
compound - ANSWER-what type of filter uses two or more materials that complement
one another in their absorbing abilities
