Radiation Therapy Essentials - MOCK EXAM || with Certified
Answers.
Regarding linear accelerators, which of the following is TRUE?
A. Maximum photon energy is equal to the energy of the electron striking the target
B. The bending magnet is rotated out of the beam in the electron mode
C. The beam current is higher in the electron mode than in the photon mode
D. The scattering foil is the primary component for photon production. correct answers A.
Maximum photon energy is equal to the energy of the electron striking the target
1 mSv is equal to ________ rem.
A. 0.01
B. 0.1
C. 1.0
D. 10 correct answers B. 0.1
If the total body is exposed to a dose of 4500 cGy in a single exposure, the most likely cause of
death would be:
A. Infection and low blood counts
B. Severe damage to the intestines
C. Cerebral edema
D. Death would not be likely with this dose correct answers C. Cerebral edema
By what factor does the intensity decrease when someone moves from 10 meters to 20 meters
away from a radioactive source?
,A. 2
B. 4
C. 10
D. 20 correct answers B. 4
What is the allowable cumulative exposure for a radiation worker?
A. One rem times the worker's age in years
B. Five rem times the worker's age in decades
C. 100 rem times the worker's age in years
D. Five rem times the worker's age in decades correct answers A. One rem times the worker's age
in years
Which of the following are interactions between an incident photon and an atomic nucleus?
A. Photoelectric
B. Compton
C. Coherent
D. Pair production correct answers D. Pair production
A barrier that attenuates the useful portion of the beam to the required degree is known as?
A. Secondary barrier
B. incident shielding
C. tenth value layer
D. Primary barrier correct answers D. Primary barrier
,A "star" shot on a linear accelerator is performed to test the rotational axis of the:
[1] collimator
[2] couch
[3] gantry
A. 1 and 2 only
B. 2 and 3 only
C. 1 and 3 only
D. 1, 2, and 3 correct answers D. 1, 2, and 3
Direct exposure to lasers that are used for patient alignment purposes can be a hazard for the:
A. Pituitary
B. Retina
C. Commissure
D. Inner Ear correct answers B. Retina
The average photon beam energy produced by a 6 MV linear accelerator is approximately _____
MV.
A. 2
B. 4
C. 6
D. 9 correct answers A. 2
, Which of the following tissues arise from mesenchymal stem cells (MSC)?
[1] blood
[2] cartilage
[3] bone
A. 1 only
B. 2 only
C. 2 and 3
D. 1, 2, and 3 correct answers D. 1, 2, and 3
In bremsstrahlung radiation, the incoming electron:
A. Interacts with an orbiting electron
B. is deflected by the nucleus of the atom
C. creates a positive and negative ion
D. cascades to a lower energy state correct answers B. is deflected by the nucleus of the atom
Exposure is:
A. Measure of ionization in air
B. Known as a biological dose equivalent
C. The absorbed dose multiplied by the quality factor
D. The possibility of a random interaction correct answers A. Measure of ionization in air
Which of the following does not ionize directly?
A. Proton
Answers.
Regarding linear accelerators, which of the following is TRUE?
A. Maximum photon energy is equal to the energy of the electron striking the target
B. The bending magnet is rotated out of the beam in the electron mode
C. The beam current is higher in the electron mode than in the photon mode
D. The scattering foil is the primary component for photon production. correct answers A.
Maximum photon energy is equal to the energy of the electron striking the target
1 mSv is equal to ________ rem.
A. 0.01
B. 0.1
C. 1.0
D. 10 correct answers B. 0.1
If the total body is exposed to a dose of 4500 cGy in a single exposure, the most likely cause of
death would be:
A. Infection and low blood counts
B. Severe damage to the intestines
C. Cerebral edema
D. Death would not be likely with this dose correct answers C. Cerebral edema
By what factor does the intensity decrease when someone moves from 10 meters to 20 meters
away from a radioactive source?
,A. 2
B. 4
C. 10
D. 20 correct answers B. 4
What is the allowable cumulative exposure for a radiation worker?
A. One rem times the worker's age in years
B. Five rem times the worker's age in decades
C. 100 rem times the worker's age in years
D. Five rem times the worker's age in decades correct answers A. One rem times the worker's age
in years
Which of the following are interactions between an incident photon and an atomic nucleus?
A. Photoelectric
B. Compton
C. Coherent
D. Pair production correct answers D. Pair production
A barrier that attenuates the useful portion of the beam to the required degree is known as?
A. Secondary barrier
B. incident shielding
C. tenth value layer
D. Primary barrier correct answers D. Primary barrier
,A "star" shot on a linear accelerator is performed to test the rotational axis of the:
[1] collimator
[2] couch
[3] gantry
A. 1 and 2 only
B. 2 and 3 only
C. 1 and 3 only
D. 1, 2, and 3 correct answers D. 1, 2, and 3
Direct exposure to lasers that are used for patient alignment purposes can be a hazard for the:
A. Pituitary
B. Retina
C. Commissure
D. Inner Ear correct answers B. Retina
The average photon beam energy produced by a 6 MV linear accelerator is approximately _____
MV.
A. 2
B. 4
C. 6
D. 9 correct answers A. 2
, Which of the following tissues arise from mesenchymal stem cells (MSC)?
[1] blood
[2] cartilage
[3] bone
A. 1 only
B. 2 only
C. 2 and 3
D. 1, 2, and 3 correct answers D. 1, 2, and 3
In bremsstrahlung radiation, the incoming electron:
A. Interacts with an orbiting electron
B. is deflected by the nucleus of the atom
C. creates a positive and negative ion
D. cascades to a lower energy state correct answers B. is deflected by the nucleus of the atom
Exposure is:
A. Measure of ionization in air
B. Known as a biological dose equivalent
C. The absorbed dose multiplied by the quality factor
D. The possibility of a random interaction correct answers A. Measure of ionization in air
Which of the following does not ionize directly?
A. Proton
