MDCB ACTUAL EXAM QUESTIONS
AND CORRECT DETAILED ANSWERS
(VERIFIED ANSWERS)
What is the approximate density of healthy tissue? -
correct answer ✅0.30 g/cc
The accelerator component that ejects electrons in to the linear
accelerator is? -
correct answer ✅Electron gun
Radiation damage to the fetus resulting in severe birth defects
would most often occur when radiation was delivered at which
time post-fertilization? -
correct answer ✅3-12 Weeks
The decay constant for a radioactive source that has a half-life of 60
days is? -
correct answer ✅.693/60=0.0155 or 0.012
The function of a maze to a megavoltage treatment room is to: -
correct answer ✅minimize radiation levels at the door
, MDCB ACTUAL EXAM QUESTIONS
AND CORRECT DETAILED ANSWERS
(VERIFIED ANSWERS)
The anatomic location of the seminal vesicles is: -
correct answer ✅superior to the prostate and angled posteriorly
near the rectum.
Two missed treatment days due to LINAC malfunction: -
correct answer ✅may be compensated by adding the same or
even more fractions to the treatment course with weekend
treatment if possible.
For a 4-field box technique, which of the following will deliver the
lowest dose to the femoral heads? -
correct answer ✅100 source-to-surface distance (SSD), equal dmax
dose to all fields
According to the American Association of Physicists in Medicine
(AAPM) Task Group Report #142, the constancy of dose per
monitor unit for photon beams of a linear accelerator should be
checked: -
correct answer ✅daily.
The surface dose rate of a Strontium-90 (Sr-90) eye applicator was
4.5 cGy/second on May 15. If a patient is to be treated 2 years later
AND CORRECT DETAILED ANSWERS
(VERIFIED ANSWERS)
What is the approximate density of healthy tissue? -
correct answer ✅0.30 g/cc
The accelerator component that ejects electrons in to the linear
accelerator is? -
correct answer ✅Electron gun
Radiation damage to the fetus resulting in severe birth defects
would most often occur when radiation was delivered at which
time post-fertilization? -
correct answer ✅3-12 Weeks
The decay constant for a radioactive source that has a half-life of 60
days is? -
correct answer ✅.693/60=0.0155 or 0.012
The function of a maze to a megavoltage treatment room is to: -
correct answer ✅minimize radiation levels at the door
, MDCB ACTUAL EXAM QUESTIONS
AND CORRECT DETAILED ANSWERS
(VERIFIED ANSWERS)
The anatomic location of the seminal vesicles is: -
correct answer ✅superior to the prostate and angled posteriorly
near the rectum.
Two missed treatment days due to LINAC malfunction: -
correct answer ✅may be compensated by adding the same or
even more fractions to the treatment course with weekend
treatment if possible.
For a 4-field box technique, which of the following will deliver the
lowest dose to the femoral heads? -
correct answer ✅100 source-to-surface distance (SSD), equal dmax
dose to all fields
According to the American Association of Physicists in Medicine
(AAPM) Task Group Report #142, the constancy of dose per
monitor unit for photon beams of a linear accelerator should be
checked: -
correct answer ✅daily.
The surface dose rate of a Strontium-90 (Sr-90) eye applicator was
4.5 cGy/second on May 15. If a patient is to be treated 2 years later
