MDCB Practice Set 1 - Test 2 questions
|\ |\ |\ |\ |\ |\ |\ |\
with answers |\
The development of which of the following conditions is
|\ |\ |\ |\ |\ |\ |\ |\ |\
an example of a stochastic effect of
|\ |\ |\ |\ |\ |\
radiation?
A. organ atrophy
|\ |\
B. second primary
|\ |\
C. pulmonary fibrosis
|\ |\
D. decreased sperm count - CORRECT ANSWERS ✔✔B
|\ |\ |\ |\ |\ |\ |\
2. When an enface electron beam is used for chest wall
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\
irradiation, which of the following |\ |\ |\ |\
describes the dose at the interface between the chest
|\ |\ |\ |\ |\ |\ |\ |\ |\
wall and lung?
|\ |\
A. decreased due to reduced scatter from the lung
|\ |\ |\ |\ |\ |\ |\ |\
B. decreased due to irregular surface contour effects
|\ |\ |\ |\ |\ |\ |\
C. increased due to an increase in the electron fluence
|\ |\ |\ |\ |\ |\ |\ |\ |\
D. increased due to a larger angle of electron scatter -
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\
CORRECT ANSWERS ✔✔A |\ |\
, 3. An averaged ionization chamber reading for a 10 cm x
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\
10 cm electron applicator is 98.5
|\ |\ |\ |\ |\
and an averaged ionization chamber reading for an
|\ |\ |\ |\ |\ |\ |\ |\
electron cut-out in a 6 cm x 10 cm |\ |\ |\ |\ |\ |\ |\ |\
applicator is 92.4. What is the monitor unit setting if 200 |\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\
cGy is prescribed to 90% and the 6 cm
|\ |\ |\ |\ |\ |\ |\ |\
x 10 cm cut-out is utilized? (The output factor for 10 cm x
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\
10 cm is 1 cGy/MU.)
|\ |\ |\ |\
A. 208 MU |\ |\
B. 217 MU |\ |\
C. 222 MU |\ |\
D. 237 MU - CORRECT ANSWERS ✔✔D
|\ |\ |\ |\ |\ |\
4. Parent and daughter radioactive isotopes are said to be
|\ |\ |\ |\ |\ |\ |\ |\ |\
in secular equilibrium when they:
|\ |\ |\ |\ |\
A. are equal in atomic weight.
|\ |\ |\ |\ |\
B. have the same half-life.
|\ |\ |\ |\
C. have a constant ratio of activity.
|\ |\ |\ |\ |\ |\
D. emit equivalent gamma energies. - CORRECT
|\ |\ |\ |\ |\ |\ |\
ANSWERS ✔✔C |\
5. To make inhomogeneity corrections in treatment plans
|\ |\ |\ |\ |\ |\ |\ |\
based on CT derived anatomical |\ |\ |\ |\
|\ |\ |\ |\ |\ |\ |\ |\
with answers |\
The development of which of the following conditions is
|\ |\ |\ |\ |\ |\ |\ |\ |\
an example of a stochastic effect of
|\ |\ |\ |\ |\ |\
radiation?
A. organ atrophy
|\ |\
B. second primary
|\ |\
C. pulmonary fibrosis
|\ |\
D. decreased sperm count - CORRECT ANSWERS ✔✔B
|\ |\ |\ |\ |\ |\ |\
2. When an enface electron beam is used for chest wall
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\
irradiation, which of the following |\ |\ |\ |\
describes the dose at the interface between the chest
|\ |\ |\ |\ |\ |\ |\ |\ |\
wall and lung?
|\ |\
A. decreased due to reduced scatter from the lung
|\ |\ |\ |\ |\ |\ |\ |\
B. decreased due to irregular surface contour effects
|\ |\ |\ |\ |\ |\ |\
C. increased due to an increase in the electron fluence
|\ |\ |\ |\ |\ |\ |\ |\ |\
D. increased due to a larger angle of electron scatter -
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\
CORRECT ANSWERS ✔✔A |\ |\
, 3. An averaged ionization chamber reading for a 10 cm x
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\
10 cm electron applicator is 98.5
|\ |\ |\ |\ |\
and an averaged ionization chamber reading for an
|\ |\ |\ |\ |\ |\ |\ |\
electron cut-out in a 6 cm x 10 cm |\ |\ |\ |\ |\ |\ |\ |\
applicator is 92.4. What is the monitor unit setting if 200 |\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\
cGy is prescribed to 90% and the 6 cm
|\ |\ |\ |\ |\ |\ |\ |\
x 10 cm cut-out is utilized? (The output factor for 10 cm x
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\
10 cm is 1 cGy/MU.)
|\ |\ |\ |\
A. 208 MU |\ |\
B. 217 MU |\ |\
C. 222 MU |\ |\
D. 237 MU - CORRECT ANSWERS ✔✔D
|\ |\ |\ |\ |\ |\
4. Parent and daughter radioactive isotopes are said to be
|\ |\ |\ |\ |\ |\ |\ |\ |\
in secular equilibrium when they:
|\ |\ |\ |\ |\
A. are equal in atomic weight.
|\ |\ |\ |\ |\
B. have the same half-life.
|\ |\ |\ |\
C. have a constant ratio of activity.
|\ |\ |\ |\ |\ |\
D. emit equivalent gamma energies. - CORRECT
|\ |\ |\ |\ |\ |\ |\
ANSWERS ✔✔C |\
5. To make inhomogeneity corrections in treatment plans
|\ |\ |\ |\ |\ |\ |\ |\
based on CT derived anatomical |\ |\ |\ |\
