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Radiation Therapy Essentials - MOCK EXAM Questions with Correct Answers
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  • Radiation therapy
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  • Radiation Therapy

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...

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  • October 7, 2024
  • 39
  • 2024/2025
  • Exam (elaborations)
  • Questions & answers

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  • radiation therapy essentials mock exam questions
  • regarding linear accelerators which of the follow

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Radiation Therapy Essentials - MOCK
EXAM Questions with Correct 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. - Answer-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 - Answer-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 - Answer-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 - Answer-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 - Answer-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 - Answer-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 - Answer-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 - Answer-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 - Answer-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 - Answer-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 - Answer-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 - Answer-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 - Answer-A. Measure of ionization in air

Which of the following does not ionize directly?

A. Proton
B. Neutron
C. Alpha particle
D. Electron - Answer-B. Neutron

The half-life of cobalt-60 is:

A. 2.5 years
B. 3.2 years
C. 5.3 years
D. 8.2 years - Answer-C. 5.3 years

Linear accelerators have which of the following type of target?

A. Hooded anode
B. Waveguide
C. Transmission
D. Rotating cathode - Answer-C. Transmission

Klystrons and magnetrons are:

A. Radiation monitors
B. Microwave sources
C. Monitors used for mechanical motions
D. Beam shaping devices - Answer-B. Microwave sources

, Which of the following is the most common metastatic site for prostate cancer?

A. Lung
B. Liver
C. Bone
D. Brain - Answer-C. Bone

The last part of the colon that leads into the rectum is known as the:

A. Ascending colon
B. Hepatic colon
C. Descending colon
D. Sigmoid colon - Answer-D. Sigmoid colon

Why do high energy photon accelerators require flattening filters?

A. To increase the penetrating ability of the beam
B. To reduce dose rates to a safe level
C. To filter out low energy photons
D. To decrease the intensity along the central axis - Answer-D. To decrease the
intensity along the central axis

Lead alone could be used in room shielding when the following interactions
predominate:

A. Photoelectric
B. Bragg peak
C. Pair production
D. Compton scattering - Answer-A. Photoelectric

The intensity of a radiation beam is measured at a distance of 100 cm and is found to
be 150 cGy/min. What is the intensity of this beam at 105 cm?

A. 136 cGy/min
B. 143 cGy/min
C. 157 cGy/min
D. 165 cGy/min - Answer-A. 136 cGy/min

What does ALARA mean?

A. Actin responsibly as soon as required
B. Advocating as little radiation as reasonable achievable
C. Reporting all accidents as soon as discovered
D. Always leaving an area right away - Answer-B. Advocating as little radiation as
reasonable achievable

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