MOCK EXAM: RADIATION THERAPY
BOARDS QUESTIONS AND ANSWERS
What is the most common side effect associated with cytotoxic drugs? - Correct
Answers -myelosuppression
What is an evaluation of a tumor in terms of degree of cellular differentiation? - Correct
Answers -Grade
According to Bergonie and Tribondeau, factors that may influence the sensitibity of a
group of cells to ionizing radiation are:
1. mitotic activity
2. time of cell division
3. cellular differentiation
4. length of mitotic activity
a. 1,2
b. 2,3
c. 1,3,4
d. 1,2,3,4 - Correct Answers -C
Prophylatic therapy is intended to:
a. relieve pain
b. heal/stall ulceration, fungation or fracture
c. improve the quality of life
d. sterilize areas of microscopic disease - Correct Answers -D
The Negative side of the basic x-ray tube is known as the:
a. anode
b. cathode
c. filament
d. vacuum - Correct Answers -B
If a 50 keV electron collides w. an inner shell e- w. a binding energy of 25keV, the
resulting photoelectron will have an energy of :
a. 25 keV
b. 75 keV
,c. 100 keV
d. 150 keV - Correct Answers -a (50keV-25keV = 25keV)
A photon of 25 A has a kinetic energy of ____keV.
a. 0.489
b. 1.82
c. 0.496
d. 0.688 - Correct Answers -C (E=12.4/lamda; E=12.4/25A = .0496 keV)
If using a tungsten target, the fraction of 4 MeV electrons converted to photons is what?
a. 10.36%
b. 12.84%
c. 11.36%
d. 9.87% - Correct Answers -A (tungsten atomic number(Z) is 74, max energy of
electron = E, use formula F=3.5x10^-4 (Z) (E) to find answer)
The probability of a photoelectric interaction _____ with increasing energies and _____
with the atomic number of the medium. - Correct Answers -decrease, increase
After alpha decay, the daughter nuclide will have an atomic mass number___ amu
lower than the parent.
a. 1
b. 2
c. 4
d. 6 - Correct Answers -C
An atom is neutral if the # of its e- is equal to its:
a. protons
b. nucleons
c. atomic weight
d. none of the above - Correct Answers -A
Solve for lambda in hours^-1
A=5mCi
A0=18mCi
t=50 hours
a. 0.0335 hrs^-1
b. 0.00256 hrs^-1
c. 0.0256 hrs^-1
d. 0.588 hrs^-1 - Correct Answers –C
Bone marrow suppression is most likely to occur when you are treating which part of the
body?
,a. skull
b. pelvic bones
c. vertebrae
d. femur - Correct Answers -B
Which of the following structures is the most radiosensitive?
a. liver
b. spine
c. brain stem
d. optic chiasm - Correct Answers -A
When treating a breast patient, the slope of the sternal notch to the xiphoid could be
corrected by:
a. aquaplast
b. vaclok system
c. arm board
d. slant board - Correct Answers -D
2 or more chemicals w/ the same chemical formula, but different nuclear states are
known as:
a. isomers
b. isotopes
c. isobars
d. isotones - Correct Answers -B
Which of the following is not true about the electromagnetic spectum?
They all have the SAME _____.
a. velocity
b. energy
c. mass
d. charge - Correct Answers -B
Radon has a T1/2 = 3.83 days . what is the average life?
a. 3.83 d
b. 4.4 d
c. 5.5 d
d. 6.6 d - Correct Answers -C (Ta=T1/2/0.693)
Carbon-14 and nitrogen-14 are
a. isotones
b. isotopes
c. isobars
, d. isomers - Correct Answers -C (same mass)
A radionuclide decays at the rate of 20% per hour. its half-life is about:
a. 2 hrs
b. 2.5 hrs
c. 3 hrs
d. 3.5 hrs
e. 4 hrs - Correct Answers -D
Different isotopes of the same element will have equal #s of ____.
a. electrons
b. protons and electrons
c. neutrons
d. electrons and neutrons
e. protons and neutrons - Correct Answers -b
A radioactive source has a half-life of 6 hours and an activity of 10 mCi at noon on
Monday. The activity at noon on Tuesday will be ____ mCi.
a. 9.375
b. 6.25
c. 2.5
d. 0.625
e. 0.31 - Correct Answers -d
(the time elapsed has been 4 half-lives. the activity may be found by mult the initial
activity by 0.5^4. or the formula A=Aoe^-lambda*t)
When a very long-lived radionuclide decays to a short-lived daughter, it is known as
____ equilibrium.
a. thermal
b. secular
c. transient
d. temporary - Correct Answers -B
An e-, p+, and alpha particle each have 20 MeV kinetic energy, Which of the following is
true?
a. the alpha particle travels at almost light speed
b. the alpha particle has the least total energy
c. the proton has the highest total energy
d. the electron travels at almost light speed - Correct Answers -D
A deutron is the nucleus of an isotope of H^2. Which of the following is true?
BOARDS QUESTIONS AND ANSWERS
What is the most common side effect associated with cytotoxic drugs? - Correct
Answers -myelosuppression
What is an evaluation of a tumor in terms of degree of cellular differentiation? - Correct
Answers -Grade
According to Bergonie and Tribondeau, factors that may influence the sensitibity of a
group of cells to ionizing radiation are:
1. mitotic activity
2. time of cell division
3. cellular differentiation
4. length of mitotic activity
a. 1,2
b. 2,3
c. 1,3,4
d. 1,2,3,4 - Correct Answers -C
Prophylatic therapy is intended to:
a. relieve pain
b. heal/stall ulceration, fungation or fracture
c. improve the quality of life
d. sterilize areas of microscopic disease - Correct Answers -D
The Negative side of the basic x-ray tube is known as the:
a. anode
b. cathode
c. filament
d. vacuum - Correct Answers -B
If a 50 keV electron collides w. an inner shell e- w. a binding energy of 25keV, the
resulting photoelectron will have an energy of :
a. 25 keV
b. 75 keV
,c. 100 keV
d. 150 keV - Correct Answers -a (50keV-25keV = 25keV)
A photon of 25 A has a kinetic energy of ____keV.
a. 0.489
b. 1.82
c. 0.496
d. 0.688 - Correct Answers -C (E=12.4/lamda; E=12.4/25A = .0496 keV)
If using a tungsten target, the fraction of 4 MeV electrons converted to photons is what?
a. 10.36%
b. 12.84%
c. 11.36%
d. 9.87% - Correct Answers -A (tungsten atomic number(Z) is 74, max energy of
electron = E, use formula F=3.5x10^-4 (Z) (E) to find answer)
The probability of a photoelectric interaction _____ with increasing energies and _____
with the atomic number of the medium. - Correct Answers -decrease, increase
After alpha decay, the daughter nuclide will have an atomic mass number___ amu
lower than the parent.
a. 1
b. 2
c. 4
d. 6 - Correct Answers -C
An atom is neutral if the # of its e- is equal to its:
a. protons
b. nucleons
c. atomic weight
d. none of the above - Correct Answers -A
Solve for lambda in hours^-1
A=5mCi
A0=18mCi
t=50 hours
a. 0.0335 hrs^-1
b. 0.00256 hrs^-1
c. 0.0256 hrs^-1
d. 0.588 hrs^-1 - Correct Answers –C
Bone marrow suppression is most likely to occur when you are treating which part of the
body?
,a. skull
b. pelvic bones
c. vertebrae
d. femur - Correct Answers -B
Which of the following structures is the most radiosensitive?
a. liver
b. spine
c. brain stem
d. optic chiasm - Correct Answers -A
When treating a breast patient, the slope of the sternal notch to the xiphoid could be
corrected by:
a. aquaplast
b. vaclok system
c. arm board
d. slant board - Correct Answers -D
2 or more chemicals w/ the same chemical formula, but different nuclear states are
known as:
a. isomers
b. isotopes
c. isobars
d. isotones - Correct Answers -B
Which of the following is not true about the electromagnetic spectum?
They all have the SAME _____.
a. velocity
b. energy
c. mass
d. charge - Correct Answers -B
Radon has a T1/2 = 3.83 days . what is the average life?
a. 3.83 d
b. 4.4 d
c. 5.5 d
d. 6.6 d - Correct Answers -C (Ta=T1/2/0.693)
Carbon-14 and nitrogen-14 are
a. isotones
b. isotopes
c. isobars
, d. isomers - Correct Answers -C (same mass)
A radionuclide decays at the rate of 20% per hour. its half-life is about:
a. 2 hrs
b. 2.5 hrs
c. 3 hrs
d. 3.5 hrs
e. 4 hrs - Correct Answers -D
Different isotopes of the same element will have equal #s of ____.
a. electrons
b. protons and electrons
c. neutrons
d. electrons and neutrons
e. protons and neutrons - Correct Answers -b
A radioactive source has a half-life of 6 hours and an activity of 10 mCi at noon on
Monday. The activity at noon on Tuesday will be ____ mCi.
a. 9.375
b. 6.25
c. 2.5
d. 0.625
e. 0.31 - Correct Answers -d
(the time elapsed has been 4 half-lives. the activity may be found by mult the initial
activity by 0.5^4. or the formula A=Aoe^-lambda*t)
When a very long-lived radionuclide decays to a short-lived daughter, it is known as
____ equilibrium.
a. thermal
b. secular
c. transient
d. temporary - Correct Answers -B
An e-, p+, and alpha particle each have 20 MeV kinetic energy, Which of the following is
true?
a. the alpha particle travels at almost light speed
b. the alpha particle has the least total energy
c. the proton has the highest total energy
d. the electron travels at almost light speed - Correct Answers -D
A deutron is the nucleus of an isotope of H^2. Which of the following is true?
