Question 1

Decay constant is expressed as which of the following?

Accepted Answer

A)  The time it takes for activity to decay to half its original value 
B)  Total number of atoms that decay per unit time 
C)  Average lifetime for the decay of radioactive atoms 
D)  Total number of atoms that decay 
A)  The time it takes for activity to decay to half its original value 
B)  Total number of atoms that decay per unit time 
C)  Average lifetime for the decay of radioactive atoms 
D)  Total number of atoms that decay B

Question 2

The radionuclide with radon as its daughter product is __________________.

Accepted Answer

A)  cobalt 60 
B)  cesium 137 
C)  iridium 192 
D)  radium 226 
A)  cobalt 60 
B)  cesium 137 
C)  iridium 192 
D)  radium 226 D

Question 3

What is the average energy of iridium 192?

Accepted Answer

A)  170 keV 
B)  730 keV 
C)  450 keV 
D)  380 keV 
A)  170 keV 
B)  730 keV 
C)  450 keV 
D)  380 keV D

Question 4

What is the purpose of dummy sources used for temporary implants?

Accepted Answer

A)  Localize the tumor in surgery 
B)  Enable visualization of source placement 
C)  Give physics residents experience with loading sources 
D)  Determine dose to the bladder and rectum 
A)  Localize the tumor in surgery 
B)  Enable visualization of source placement 
C)  Give physics residents experience with loading sources 
D)  Determine dose to the bladder and rectum

Question 5

The Paterson-Parker (Manchester)system uses a set of guidelines to do which of the following?
I.Provide a dose of +10% within the implanted area
II.Assume the use of linear sources to be implanted
III.Use a uniform distribution of radioactive material to produce a uniform dose distribution

Accepted Answer

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

Question 6

Which of the following is the radionuclide with the largest average photon energy?

Accepted Answer

A)  Cobalt 60 
B)  Cesium 137 
C)  Iridium 192 
D)  Radium 226 
A)  Cobalt 60 
B)  Cesium 137 
C)  Iridium 192 
D)  Radium 226

Question 7

The half-life of radium is __________________.

Accepted Answer

A)  1.6 years 
B)  162 days 
C)  1,622 years 
D)  16 years 
A)  1.6 years 
B)  162 days 
C)  1,622 years 
D)  16 years

Question 8

Of the following, which brachytherapy application would be used to treat the breast?

Accepted Answer

A)  Intracavitary 
B)  Interstitial 
C)  Topical 
D)  Permanent implant 
A)  Intracavitary 
B)  Interstitial 
C)  Topical 
D)  Permanent implant

Question 9

Areas commonly treated with external applicators include which of the following?
I.Hard palate
II.Skin
III.Orbital cavity

Accepted Answer

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

Question 10

The Paris system is based on which of the following?

Accepted Answer

A)  Radioactive sources must be rectilinear. 
B)  Source centers must be in a different plane. 
C)  Linear activity must be nonuniform along each source. 
D)  Sources can be spaced at any distance. 
A)  Radioactive sources must be rectilinear. 
B)  Source centers must be in a different plane. 
C)  Linear activity must be nonuniform along each source. 
D)  Sources can be spaced at any distance.

Question 11

Which of the following is true regarding the Quimby system?

Accepted Answer

A)  It is used more often than the Paterson-Parker system. 
B)  It is adapted into system called the Manchester system. 
C)  There is a uniform distribution of activity within the implant. 
D)  The result is a uniform dose distribution. 
A)  It is used more often than the Paterson-Parker system. 
B)  It is adapted into system called the Manchester system. 
C)  There is a uniform distribution of activity within the implant. 
D)  The result is a uniform dose distribution.

Question 12

The average or mean life of iridium 192 is __________ days.

Accepted Answer

A)  51 
B)  74 
C)  107 
D)  148 
A)  51 
B)  74 
C)  107 
D)  148

Question 13

Which of the following is one disadvantage of radium?

Accepted Answer

A)  Has a long half-life 
B)  Decays by alpha emission 
C)  It is not as effective as other radioisotopes 
D)  Decays to form a radon, a dangerous gas 
A)  Has a long half-life 
B)  Decays by alpha emission 
C)  It is not as effective as other radioisotopes 
D)  Decays to form a radon, a dangerous gas

Question 14

Which of the following brachytherapy sources is used to treat breast cancer?

Accepted Answer

A)  Gold 198 
B)  Iodine 125 
C)  Iridium 192 
D)  Radium 226 
A)  Gold 198 
B)  Iodine 125 
C)  Iridium 192 
D)  Radium 226

Question 15

What is the half-life of gold 198?

Accepted Answer

A)  27 days 
B)  27 years 
C)  2.7 days 
D)  3.8 days 
A)  27 days 
B)  27 years 
C)  2.7 days 
D)  3.8 days

Question 16

What is an advantage of remote afterloading?

Accepted Answer

A)  Less invasive for the patient 
B)  Limits exposure to the patient and personnel 
C)  Decreased treatment time 
D)  Allows the patient to have a semiprivate room 
A)  Less invasive for the patient 
B)  Limits exposure to the patient and personnel 
C)  Decreased treatment time 
D)  Allows the patient to have a semiprivate room

Question 17

An autoradiograph is taken to ________________________.

Accepted Answer

A)  determine the energy of the source 
B)  check source placement in the patient 
C)  verify uniformity of source 
D)  determine source strength 
A)  determine the energy of the source 
B)  check source placement in the patient 
C)  verify uniformity of source 
D)  determine source strength

Question 18

Tandem and ovoids are used to treat which of the following?

Accepted Answer

A)  Prostate 
B)  Bladder 
C)  Cervix 
D)  Esophagus 
A)  Prostate 
B)  Bladder 
C)  Cervix 
D)  Esophagus

Question 19

The term radium substitute in brachytherapy indicates which of the following?

Accepted Answer

A)  An isotope whose dosimetry is based on original radium work 
B)  An isotope whose dosimetry is more accurate than that of radium 
C)  Any source implemented when radium is unavailable 
D)  A source that has a greater average energy than radium 
A)  An isotope whose dosimetry is based on original radium work 
B)  An isotope whose dosimetry is more accurate than that of radium 
C)  Any source implemented when radium is unavailable 
D)  A source that has a greater average energy than radium

Question 20

Which of the following is true regarding cobalt 60?

Accepted Answer

A)  It is a common radionuclide used in brachytherapy. 
B)  It has a half-life of 5.27 years. 
C)  Its energy is 3.25 MeV. 
D)  It was not effective as an external beam source. 
A)  It is a common radionuclide used in brachytherapy. 
B)  It has a half-life of 5.27 years. 
C)  Its energy is 3.25 MeV. 
D)  It was not effective as an external beam source.

Exam 14: Aspects of Brachytherapy

Decay constant is expressed as which of the following?

The radionuclide with radon as its daughter product is __________________.

What is the average energy of iridium 192?

What is the purpose of dummy sources used for temporary implants?

The Paterson-Parker (Manchester)system uses a set of guidelines to do which of the following? I.Provide a dose of +10% within the implanted area II.Assume the use of linear sources to be implanted III.Use a uniform distribution of radioactive material to produce a uniform dose distribution

Which of the following is the radionuclide with the largest average photon energy?

The half-life of radium is __________________.

Of the following, which brachytherapy application would be used to treat the breast?

Areas commonly treated with external applicators include which of the following? I.Hard palate II.Skin III.Orbital cavity

The Paris system is based on which of the following?

Which of the following is true regarding the Quimby system?

The average or mean life of iridium 192 is __________ days.

Which of the following is one disadvantage of radium?

Which of the following brachytherapy sources is used to treat breast cancer?

What is the half-life of gold 198?

What is an advantage of remote afterloading?

An autoradiograph is taken to ________________________.

Tandem and ovoids are used to treat which of the following?

The term radium substitute in brachytherapy indicates which of the following?

Which of the following is true regarding cobalt 60?

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