MDCB Practice Set 1 - Test 3 Exam
Questions With 100% Verified Answers
1. As the energy of the parallel-opposed x-rays beams of same
energy increases, it will lead to:
A. decreased dose at midplane.
B. decreased skin dose.
C. increased dose in build-up region.
D. increased dose at Dmax. -
correct answer ✅B
2. In the small volume treatment of bladder cancer with radiation
therapy, the patient should be
treated with:
A. a full bladder in order to spare as much small bowel as possible.
B. a full bladder in order to spread the dose evenly to the tumor.
C. an empty bladder in order to encompass tumor with
reproducibility.
D. an empty bladder in order to minimize bleeding complications. -
correct answer ✅C
3. Although they receive the same dose, some tissues exhibit acute
radiation damage earlier than
others because they have a:
,MDCB Practice Set 1 - Test 3 Exam
Questions With 100% Verified Answers
A. smaller number of metabolizing cells.
B. reduced blood flow.
C. lower number of hypoxic cells.
D. higher mitotic index. -
correct answer ✅D
4. A 20 cm diameter patient is treated to midplane by using a 100
cm source-to-axis distance
(SAD) technique. If the same patient is then treated by using a 100
cm source-to-surface
distance (SSD) technique, the monitor units would increase by
approximately:
A. 10%.
B. 15%.
C. 21%.
D. 25%. -
correct answer ✅C
5. According to the NCRP Report #116, the annual effective dose
limit for continuous exposure to
the whole body for the general public is:
, MDCB Practice Set 1 - Test 3 Exam
Questions With 100% Verified Answers
A. 0.5 mSv (0.05 rem).
B. 1.0 mSv (0.10 rem).
C. 15.0 mSv (1.50 rem).
D. 75.0 mSv (7.50 rem). -
correct answer ✅B
6. Unless otherwise permitted by the NRC, brachytherapy needles
and tubes must be leak tested
by the user at intervals NOT to exceed:
A. 1 month.
B. 3 months.
C. 6 months.
D. 9 months. -
correct answer ✅C
7. An orthovoltage beam is used to deliver 350 cGy to a depth of 5
cm. Calculate the timer setting
for an SSD of 52 cm given the following information:
Exposure rate = 128 R/min at 50 cm source-to-surface distance
(SSD)
"cGy/R" factor = 0.95 cGy/R
Questions With 100% Verified Answers
1. As the energy of the parallel-opposed x-rays beams of same
energy increases, it will lead to:
A. decreased dose at midplane.
B. decreased skin dose.
C. increased dose in build-up region.
D. increased dose at Dmax. -
correct answer ✅B
2. In the small volume treatment of bladder cancer with radiation
therapy, the patient should be
treated with:
A. a full bladder in order to spare as much small bowel as possible.
B. a full bladder in order to spread the dose evenly to the tumor.
C. an empty bladder in order to encompass tumor with
reproducibility.
D. an empty bladder in order to minimize bleeding complications. -
correct answer ✅C
3. Although they receive the same dose, some tissues exhibit acute
radiation damage earlier than
others because they have a:
,MDCB Practice Set 1 - Test 3 Exam
Questions With 100% Verified Answers
A. smaller number of metabolizing cells.
B. reduced blood flow.
C. lower number of hypoxic cells.
D. higher mitotic index. -
correct answer ✅D
4. A 20 cm diameter patient is treated to midplane by using a 100
cm source-to-axis distance
(SAD) technique. If the same patient is then treated by using a 100
cm source-to-surface
distance (SSD) technique, the monitor units would increase by
approximately:
A. 10%.
B. 15%.
C. 21%.
D. 25%. -
correct answer ✅C
5. According to the NCRP Report #116, the annual effective dose
limit for continuous exposure to
the whole body for the general public is:
, MDCB Practice Set 1 - Test 3 Exam
Questions With 100% Verified Answers
A. 0.5 mSv (0.05 rem).
B. 1.0 mSv (0.10 rem).
C. 15.0 mSv (1.50 rem).
D. 75.0 mSv (7.50 rem). -
correct answer ✅B
6. Unless otherwise permitted by the NRC, brachytherapy needles
and tubes must be leak tested
by the user at intervals NOT to exceed:
A. 1 month.
B. 3 months.
C. 6 months.
D. 9 months. -
correct answer ✅C
7. An orthovoltage beam is used to deliver 350 cGy to a depth of 5
cm. Calculate the timer setting
for an SSD of 52 cm given the following information:
Exposure rate = 128 R/min at 50 cm source-to-surface distance
(SSD)
"cGy/R" factor = 0.95 cGy/R
