Question 1

The photon energy emitted by cobalt 60 is _______ MeV.

Accepted Answer

A)  1.36 and 1.01 
B)  .662 and 1.5 
C)  1.00 and 1.5 
D)  1.17 and 1.33 
A)  1.36 and 1.01 
B)  .662 and 1.5 
C)  1.00 and 1.5 
D)  1.17 and 1.33 D

Question 2

Which of the following is (are)true of electron beams?

Accepted Answer

A)  Require a flattening filter to make the electron beam profile symmetric and flat 
B)  Require a scattering foil to make the electron beam profile symmetric and flat 
C)  Interact with the transmission target before leaving the exit window 
D)  a, b, and c 
E)  b and c 
A)  Require a flattening filter to make the electron beam profile symmetric and flat 
B)  Require a scattering foil to make the electron beam profile symmetric and flat 
C)  Interact with the transmission target before leaving the exit window 
D)  a, b, and c 
E)  b and c B

Question 3

The circulator in a linear accelerator does which of the following?

Accepted Answer

A)  Mixes the hot and cold water to get the right temperature 
B)  Spins the electrons in the right direction 
C)  Conducts microwaves from the radiofrequency (RF)driver into the klystron 
D)  Isolates the klystron from reflected microwave power 
A)  Mixes the hot and cold water to get the right temperature 
B)  Spins the electrons in the right direction 
C)  Conducts microwaves from the radiofrequency (RF)driver into the klystron 
D)  Isolates the klystron from reflected microwave power D

Question 4

Which of the following limited the use of orthovoltage x-ray machines for radiation therapy?

Accepted Answer

A)  Skin dose tolerance 
B)  Proton contamination 
C)  Excessive dose rate 
D)  Neutron contamination 
E)  The Nuclear Regulatory Commission requirement 
A)  Skin dose tolerance 
B)  Proton contamination 
C)  Excessive dose rate 
D)  Neutron contamination 
E)  The Nuclear Regulatory Commission requirement

Question 5

Which of the following best describes the major components of a linear accelerator?

Accepted Answer

A)  Power supply, modulator, electron gun, accelerating waveguide, head, beryllium target 
B)  Power supply, modulator, klystron, electron gun, "D"s, beryllium target 
C)  Power supply, electron gun, accelerating waveguide, head, doughnut accelerator structure 
D)  Modulator, klystron, electron gun, accelerator structure, waveguide, bending magnet 
A)  Power supply, modulator, electron gun, accelerating waveguide, head, beryllium target 
B)  Power supply, modulator, klystron, electron gun, "D"s, beryllium target 
C)  Power supply, electron gun, accelerating waveguide, head, doughnut accelerator structure 
D)  Modulator, klystron, electron gun, accelerator structure, waveguide, bending magnet

Question 6

When using multileaf collimation, which concerns need to be evaluated?

Accepted Answer

A)  Penumbra between the leaves and the transmission of the leaves 
B)  Movement of MLCs during the treatment give variations in dose that need to be evaluated along with penumbra between the leaves 
C)  Movement of MLCs during treatment and interleaf transmission leakage 
D)  Penumbra at the end of the leaves and interleaf transmission leakage 
A)  Penumbra between the leaves and the transmission of the leaves 
B)  Movement of MLCs during the treatment give variations in dose that need to be evaluated along with penumbra between the leaves 
C)  Movement of MLCs during treatment and interleaf transmission leakage 
D)  Penumbra at the end of the leaves and interleaf transmission leakage

Question 7

Depth of maximum dose for a 10-MV machine is how far below the skin surface?

Accepted Answer

A)  0.5 cm 
B)  1.5 cm 
C)  2.5 cm 
D)  5 cm 
A)  0.5 cm 
B)  1.5 cm 
C)  2.5 cm 
D)  5 cm

Question 8

Which of the following is the half-life of a cobalt 60 source?

Accepted Answer

A)  30 years 
B)  1,600 years 
C)  5.26 years 
D)  74.2 days 
A)  30 years 
B)  1,600 years 
C)  5.26 years 
D)  74.2 days

Question 9

Orthovoltage x-ray machines have energies in the range of which of the following?

Accepted Answer

A)  1 kV to 100 kV 
B)  150 kV to 500 kV 
C)  200 MeV to 400 MeV 
D)  None of the above 
A)  1 kV to 100 kV 
B)  150 kV to 500 kV 
C)  200 MeV to 400 MeV 
D)  None of the above

Question 10

Of the following treatment units, which has the least amount of skin sparing?

Accepted Answer

A)  Orthovoltage 
B)  Cobalt 
C)  4 MV beam 
D)  10 MV beam 
A)  Orthovoltage 
B)  Cobalt 
C)  4 MV beam 
D)  10 MV beam

Question 11

Lipowitz metal is composed of which of the following?

Accepted Answer

A)  Tin, bismuth, lead, and cadmium 
B)  Lead, tungsten, and tin 
C)  Tin, bismuth, tungsten, and lead 
D)  Bismuth, cadmium, and lead 
A)  Tin, bismuth, lead, and cadmium 
B)  Lead, tungsten, and tin 
C)  Tin, bismuth, tungsten, and lead 
D)  Bismuth, cadmium, and lead

Question 12

When treating with electrons, the carousel rotates to place a _________________ in the beam to spread it out.

Accepted Answer

A)  collimator 
B)  cone 
C)  scattering foil 
D)  flattening filter 
A)  collimator 
B)  cone 
C)  scattering foil 
D)  flattening filter

Question 13

Depth of maximum dose for a 15-MV machine is how far below the skin surface?

Accepted Answer

A)  0.5 cm 
B)  1.5 cm 
C)  2.5 cm 
D)  3 cm 
A)  0.5 cm 
B)  1.5 cm 
C)  2.5 cm 
D)  3 cm

Question 14

At what rate does the cobalt 60 source decay?

Accepted Answer

A)  1% per month 
B)  2% per month 
C)  3% per month 
D)  5% per month 
A)  1% per month 
B)  2% per month 
C)  3% per month 
D)  5% per month

Question 15

Which of the following is not found inside the head of a linear accelerator?

Accepted Answer

A)  Ion chambers 
B)  Target 
C)  Accelerator structure 
D)  Bending magnet 
E)  Scattering foil 
A)  Ion chambers 
B)  Target 
C)  Accelerator structure 
D)  Bending magnet 
E)  Scattering foil

Question 16

Which of the following best describes the order in which electron bunches and the resulting x-rays travel through the head of a linear accelerator?

Accepted Answer

A)  Bending magnet, dose chambers, target, flattening filter, wedge 
B)  Bending magnet, target, dose chambers, primary collimator, wedge, flattening filter 
C)  Bending magnet, target, primary collimator, flattening filter, wedge, dose chamber 
D)  Bending magnet, target, primary collimator, flattening filter, dose chamber, multileaf collimator 
E)  Bending magnet, dose chambers, target, flattening filter, primary collimator, multileaf collimator 
A)  Bending magnet, dose chambers, target, flattening filter, wedge 
B)  Bending magnet, target, dose chambers, primary collimator, wedge, flattening filter 
C)  Bending magnet, target, primary collimator, flattening filter, wedge, dose chamber 
D)  Bending magnet, target, primary collimator, flattening filter, dose chamber, multileaf collimator 
E)  Bending magnet, dose chambers, target, flattening filter, primary collimator, multileaf collimator

Question 17

A Van de Graaff machine __________________.
I.is an electrostatic generator
II.operates at 2 MV
III.operates a 200 kV
IV.uses a doughnut-shaped accelerator structure

Accepted Answer

A)  I and II 
B)  II and IV 
C)  III and IV 
D)  I and IV 
A)  I and II 
B)  II and IV 
C)  III and IV 
D)  I and IV

Question 18

A bending magnet in an accelerator may be used to do which of the following?

Accepted Answer

A)  Help deflect microwave power 
B)  Deflect (bend)the electron beam 
C)  Gather stray electrons together in a bunch 
D)  Gather random paper clips 
A)  Help deflect microwave power 
B)  Deflect (bend)the electron beam 
C)  Gather stray electrons together in a bunch 
D)  Gather random paper clips

Question 19

Image-guided radiation therapy (IGRT)can be accomplished with ____________.
I.ultrasound units
II.computed tomography (CT)scanner
III.kV imager
IV.cone beam
V.simulator

Accepted Answer

A)  I, III, and IV 
B)  II, III, and V 
C)  I, II, III, and IV 
D)  III, IV, and V 
A)  I, III, and IV 
B)  II, III, and V 
C)  I, II, III, and IV 
D)  III, IV, and V

Question 20

Some of the more common medical accelerator hazards include which of the following?
I.Incorrect dose delivered
II.Dose delivered to wrong area
III.Machine collision
IV.Emergency off malfunction

Accepted Answer

A)  I, II, and IV 
B)  II, III, and IV 
C)  I, III, and IV 
D)  I, II, and III 
A)  I, II, and IV 
B)  II, III, and IV 
C)  I, III, and IV 
D)  I, II, and III

Exam 7: Treatment Delivery Equipment

The photon energy emitted by cobalt 60 is _______ MeV.

Which of the following is (are)true of electron beams?

The circulator in a linear accelerator does which of the following?

Which of the following limited the use of orthovoltage x-ray machines for radiation therapy?

Which of the following best describes the major components of a linear accelerator?

When using multileaf collimation, which concerns need to be evaluated?

Depth of maximum dose for a 10-MV machine is how far below the skin surface?

Which of the following is the half-life of a cobalt 60 source?

Orthovoltage x-ray machines have energies in the range of which of the following?

Of the following treatment units, which has the least amount of skin sparing?

Lipowitz metal is composed of which of the following?

When treating with electrons, the carousel rotates to place a _________________ in the beam to spread it out.

Depth of maximum dose for a 15-MV machine is how far below the skin surface?

At what rate does the cobalt 60 source decay?

Which of the following is not found inside the head of a linear accelerator?

Which of the following best describes the order in which electron bunches and the resulting x-rays travel through the head of a linear accelerator?

A Van de Graaff machine __________________. I.is an electrostatic generator II.operates at 2 MV III.operates a 200 kV IV.uses a doughnut-shaped accelerator structure

A bending magnet in an accelerator may be used to do which of the following?

Image-guided radiation therapy (IGRT)can be accomplished with ____________. I.ultrasound units II.computed tomography (CT)scanner III.kV imager IV.cone beam V.simulator

Some of the more common medical accelerator hazards include which of the following? I.Incorrect dose delivered II.Dose delivered to wrong area III.Machine collision IV.Emergency off malfunction

Cancer: An Overview

The Ethics and Legal Considerations of Cancer Management

Principles of Pathology

Overview of Radiobiology

Detection and Diagnosis

Medical Imaging

Treatment Procedures

Infection Control in Radiation Oncology Facilities

Patient Assessment

Pharmacology and Drug Administration

Applied Mathematics Review

Introduction to Radiation Therapy Physics

Aspects of Brachytherapy

Special Procedures

Particle Therapy

Radiation Safety and Protection

Patient Safety in Radiation Oncology

Quality Improvement in Radiation Oncology

Surface and Sectional Anatomy

Simulator Design

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Photon Dosimetry Concepts and Calculations

Photon Dose Distributions

Electron Beams in Radiation Therapy

Electronic Charting and Image Management

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