LRA 211 Final Exam Questions and
Answers (Rated A+)
Leakage radiation must not exceed - correct answer ✅Less than 100 mR/hr
Size of target window - correct answer ✅Usually 5cm squared
The x-ray tube is situated in a - correct answer ✅Protective housing
The protective housing is made up of - correct answer ✅-Lead lined structure
-Oil bath (99% heat, 1% x-ray)
-Cooling fans
-Electrical insulation
-Large cables
-Absorbs stray photons
What is the glass envelope made of - correct answer ✅Borosilicate glass (pyrex)
because it is heat resistant
Anode - correct answer ✅The anode is the positive end of the tube. It provides
the target for electron interaction to produce x-rays and is an electrical and
thermal conductor. Designed to dissipate heat
Tungsten - correct answer ✅Has a high atomic number that can withstand heat
Stator - correct answer ✅The stator is made up of electromagnets arranged in
pairs around the rotor. The stator is outside the tube enclosure.
,LRA 211 Final Exam Questions and
Answers (Rated A+)
Rotor - correct answer ✅The rotor is made of an iron core surrounded by coils
and located in the center of the stator but within the enclosure. The rotor does
not touch the stator, nor is it supplied with electric current. It is operated through
mutual induction.
Cathode - correct answer ✅Negative end of the tube. It provides the source of
electrons needed for x-ray production. The cathode is made up of the filaments
and the focusing cup
Which component of the x-ray tube is responsible for concentrating the electron
cloud - correct answer ✅Focusing cup
The x-ray tube is part of the - correct answer ✅X-ray circuit secondary
Thermionic emission - correct answer ✅The process of electrons being burned
off of the filament
What is the target window designed for - correct answer ✅The desired exit point
of the x-rays produced. The target window is fashioned to minimally interfere with
(absorb) the x-rays
The intensity of the x-ray beam is more - correct answer ✅On the cathode side
What reduces leakage radiation to required standards - correct answer
✅Protective housing
, LRA 211 Final Exam Questions and
Answers (Rated A+)
The term space charge within the x-ray tube refers to - correct answer ✅Free
electrons
What makes up the cathode - correct answer ✅Dual-focus tubes (2 filaments)
Focusing cup
Molybdenum - correct answer ✅Used as the disk base and core because it has a
low thermal conductivity and it is a light but strong alloy
A rotating anode is made up of - correct answer ✅A rotating tungsten-coated
(high atomic number) molybdenum disc mounted on a copper shaft with a
molybdenum core
Housing - correct answer ✅A protective housing provides solid mechanical
support
Electromagnetic radiation - correct answer ✅A form of energy that originates
from the atom, can exist apart from matter and travel through a vacuum
The relationship between wavelength and frequency is - correct answer
✅Inverse
Wavelengths are measured in - correct answer ✅Meters, from crest to crest
Answers (Rated A+)
Leakage radiation must not exceed - correct answer ✅Less than 100 mR/hr
Size of target window - correct answer ✅Usually 5cm squared
The x-ray tube is situated in a - correct answer ✅Protective housing
The protective housing is made up of - correct answer ✅-Lead lined structure
-Oil bath (99% heat, 1% x-ray)
-Cooling fans
-Electrical insulation
-Large cables
-Absorbs stray photons
What is the glass envelope made of - correct answer ✅Borosilicate glass (pyrex)
because it is heat resistant
Anode - correct answer ✅The anode is the positive end of the tube. It provides
the target for electron interaction to produce x-rays and is an electrical and
thermal conductor. Designed to dissipate heat
Tungsten - correct answer ✅Has a high atomic number that can withstand heat
Stator - correct answer ✅The stator is made up of electromagnets arranged in
pairs around the rotor. The stator is outside the tube enclosure.
,LRA 211 Final Exam Questions and
Answers (Rated A+)
Rotor - correct answer ✅The rotor is made of an iron core surrounded by coils
and located in the center of the stator but within the enclosure. The rotor does
not touch the stator, nor is it supplied with electric current. It is operated through
mutual induction.
Cathode - correct answer ✅Negative end of the tube. It provides the source of
electrons needed for x-ray production. The cathode is made up of the filaments
and the focusing cup
Which component of the x-ray tube is responsible for concentrating the electron
cloud - correct answer ✅Focusing cup
The x-ray tube is part of the - correct answer ✅X-ray circuit secondary
Thermionic emission - correct answer ✅The process of electrons being burned
off of the filament
What is the target window designed for - correct answer ✅The desired exit point
of the x-rays produced. The target window is fashioned to minimally interfere with
(absorb) the x-rays
The intensity of the x-ray beam is more - correct answer ✅On the cathode side
What reduces leakage radiation to required standards - correct answer
✅Protective housing
, LRA 211 Final Exam Questions and
Answers (Rated A+)
The term space charge within the x-ray tube refers to - correct answer ✅Free
electrons
What makes up the cathode - correct answer ✅Dual-focus tubes (2 filaments)
Focusing cup
Molybdenum - correct answer ✅Used as the disk base and core because it has a
low thermal conductivity and it is a light but strong alloy
A rotating anode is made up of - correct answer ✅A rotating tungsten-coated
(high atomic number) molybdenum disc mounted on a copper shaft with a
molybdenum core
Housing - correct answer ✅A protective housing provides solid mechanical
support
Electromagnetic radiation - correct answer ✅A form of energy that originates
from the atom, can exist apart from matter and travel through a vacuum
The relationship between wavelength and frequency is - correct answer
✅Inverse
Wavelengths are measured in - correct answer ✅Meters, from crest to crest
