LRA 211 CH.5 THE X-RAY TUBE
QUESTIONSD ND NSWERS WITH
COMPLETE SOLUTIONS 100%
CORRECT RATED A+
1. Why is the protective housing lined with lead?
Answer: ✔✔ To keep stray radiation inside, to absorb stray photons.
Explanation:
The protective housing of the x-ray tube is lined with lead to help contain
radiation and absorb any stray x-ray photons that are produced inside the
tube. This reduces the amount of leakage radiation that could escape and
expose the surrounding environment, including both the operator and the
patient. It also ensures that the radiation is directed only toward the patient
or the image receptor.
2. Where is the induction motor?
Answer: ✔✔ Also known as the stator, outside of the glass envelope.
Explanation:
The induction motor, which is used to rotate the anode of the x-ray tube, is
typically located outside the glass envelope. It consists of two parts: the
stator, which is stationary and placed outside the tube, and the rotor, which
is located inside the tube and is attached to the anode. The stator generates a
rotating magnetic field that induces rotation in the rotor, allowing the anode
to spin and help dissipate heat.
3. Main purpose of the vacuum
Answer: ✔✔ Prevent arcing.
Explanation:
The vacuum inside the x-ray tube serves to prevent arcing (electrical
discharge) between the cathode and anode. Arcing could occur if air (or gas)
, were present in the tube, which would allow electrons to travel
unpredictably, leading to equipment failure or damage. The vacuum also
helps to ensure that electrons can travel freely from the cathode to the anode
without interference from air molecules, which ensures the efficient
production of x-rays.
4. What is the glass envelope made of?
Answer: ✔✔ Borosilicate glass.
Explanation:
The glass envelope (or tube housing) of an x-ray tube is typically made of
borosilicate glass. This material is chosen because it is highly resistant to
thermal shock and chemical damage. The envelope is designed to contain
the vacuum and help prevent damage to the internal components while
allowing radiation to pass through the target window.
5. Where does the x-ray beam come out of?
Answer: ✔✔ The target window.
Explanation:
The x-ray beam exits the tube through the target window. This window is a
thin, transparent area of the glass envelope that allows the x-rays to pass
through while minimizing any absorption or scattering of the beam. The
window is designed to be as thin as possible while maintaining structural
integrity, as it is the point through which the x-ray photons exit the tube and
are directed toward the patient.
6. Anode
Answer: ✔✔ Least intensity
Explanation:
Due to the anode heel effect, the x-ray beam is less intense on the anode
side of the field. The anode heel effect is a result of the x-rays having to
pass through the anode material before exiting the tube. The anode side of
QUESTIONSD ND NSWERS WITH
COMPLETE SOLUTIONS 100%
CORRECT RATED A+
1. Why is the protective housing lined with lead?
Answer: ✔✔ To keep stray radiation inside, to absorb stray photons.
Explanation:
The protective housing of the x-ray tube is lined with lead to help contain
radiation and absorb any stray x-ray photons that are produced inside the
tube. This reduces the amount of leakage radiation that could escape and
expose the surrounding environment, including both the operator and the
patient. It also ensures that the radiation is directed only toward the patient
or the image receptor.
2. Where is the induction motor?
Answer: ✔✔ Also known as the stator, outside of the glass envelope.
Explanation:
The induction motor, which is used to rotate the anode of the x-ray tube, is
typically located outside the glass envelope. It consists of two parts: the
stator, which is stationary and placed outside the tube, and the rotor, which
is located inside the tube and is attached to the anode. The stator generates a
rotating magnetic field that induces rotation in the rotor, allowing the anode
to spin and help dissipate heat.
3. Main purpose of the vacuum
Answer: ✔✔ Prevent arcing.
Explanation:
The vacuum inside the x-ray tube serves to prevent arcing (electrical
discharge) between the cathode and anode. Arcing could occur if air (or gas)
, were present in the tube, which would allow electrons to travel
unpredictably, leading to equipment failure or damage. The vacuum also
helps to ensure that electrons can travel freely from the cathode to the anode
without interference from air molecules, which ensures the efficient
production of x-rays.
4. What is the glass envelope made of?
Answer: ✔✔ Borosilicate glass.
Explanation:
The glass envelope (or tube housing) of an x-ray tube is typically made of
borosilicate glass. This material is chosen because it is highly resistant to
thermal shock and chemical damage. The envelope is designed to contain
the vacuum and help prevent damage to the internal components while
allowing radiation to pass through the target window.
5. Where does the x-ray beam come out of?
Answer: ✔✔ The target window.
Explanation:
The x-ray beam exits the tube through the target window. This window is a
thin, transparent area of the glass envelope that allows the x-rays to pass
through while minimizing any absorption or scattering of the beam. The
window is designed to be as thin as possible while maintaining structural
integrity, as it is the point through which the x-ray photons exit the tube and
are directed toward the patient.
6. Anode
Answer: ✔✔ Least intensity
Explanation:
Due to the anode heel effect, the x-ray beam is less intense on the anode
side of the field. The anode heel effect is a result of the x-rays having to
pass through the anode material before exiting the tube. The anode side of
