MDCB review Questions with Complete
Solutions
0.1 mSv/wk For shielding, what is the design goal for a restricted area?
22 degree C, 760 mm Hg In dose measurements using an ion chamber, the reading is
corrected to the reading that would have been found at the standard temperature and pressure of:
MVCT A disadvantage of the Tomotherapy system is:
55 Gy During tx of a rectum, 50% of the bladder should recieve no more than what dose?
Dd/ Ddmax under SSD conditions PDD =
entrance and exit of each field at dmax level and off to the side Where is the global hot
spot in a AP/PA field arrangement?
,ICRU 83 Dose prescribing, recording, and reporting in IMRT s discussed in which ICRU
report?
The ratio of the volume of 50% of the Rx dose to the volume of the PTV SBRT utilizes a
factor called R50. What does it represent?
T2 The suprasternal notch is located at what vertebral level?
M, G2, G1, Early S, Late S List in order from most to least sensitive the parts of the cell
cycle.
CTDIvol x scan length DLP =
L1 The hilum of the rt kidney is located at what vertebral level?
2 MeV/ cm Electron energy loss =
TG 53 What task group addresses TPS testing and QA?
,1.06 What is the average density of muscle
120 mm In an adult the approximate length of a rectum in mm is?
NCRP 147 Shielding Ref for Diagnostic x-ray and CT is found in which document?
5000 cGy What is the RTOG tolerance dose for a femoral head
8.06 days The half life for the isotope used for the treatment of thyroid cancer is
approximately:
distal part of the bragg-peak The RBE for protons is the highest at what part of the Bragg
curve
Co60, CS137, Ir192, I125 List from highest to lowest the HVL for the respective
isotopes: Co60, I125, Cs137, Ir192
, Cs137 Which has the highest energy: Cs137, I125, F18, Pd103?
Pd103 Which has the lowest energy: Cs137,I125, F18, Pd103?
8.30 MeV The average energy of a 25 MV photon beam is
Z^2 Pair production is proportional to Z in what way?
10% Prior to a prostate seed implant a sample of the seeds needs to be sampled for a
calibration check. What is the required sampling?
<10% Identify the V20 for lungs for SBRT
5000cGy Pathologic fracture of the ribs can occur at what dose?
</= 0.005 uCi What is the radiation safety limit for a sealed source wipe test?
Solutions
0.1 mSv/wk For shielding, what is the design goal for a restricted area?
22 degree C, 760 mm Hg In dose measurements using an ion chamber, the reading is
corrected to the reading that would have been found at the standard temperature and pressure of:
MVCT A disadvantage of the Tomotherapy system is:
55 Gy During tx of a rectum, 50% of the bladder should recieve no more than what dose?
Dd/ Ddmax under SSD conditions PDD =
entrance and exit of each field at dmax level and off to the side Where is the global hot
spot in a AP/PA field arrangement?
,ICRU 83 Dose prescribing, recording, and reporting in IMRT s discussed in which ICRU
report?
The ratio of the volume of 50% of the Rx dose to the volume of the PTV SBRT utilizes a
factor called R50. What does it represent?
T2 The suprasternal notch is located at what vertebral level?
M, G2, G1, Early S, Late S List in order from most to least sensitive the parts of the cell
cycle.
CTDIvol x scan length DLP =
L1 The hilum of the rt kidney is located at what vertebral level?
2 MeV/ cm Electron energy loss =
TG 53 What task group addresses TPS testing and QA?
,1.06 What is the average density of muscle
120 mm In an adult the approximate length of a rectum in mm is?
NCRP 147 Shielding Ref for Diagnostic x-ray and CT is found in which document?
5000 cGy What is the RTOG tolerance dose for a femoral head
8.06 days The half life for the isotope used for the treatment of thyroid cancer is
approximately:
distal part of the bragg-peak The RBE for protons is the highest at what part of the Bragg
curve
Co60, CS137, Ir192, I125 List from highest to lowest the HVL for the respective
isotopes: Co60, I125, Cs137, Ir192
, Cs137 Which has the highest energy: Cs137, I125, F18, Pd103?
Pd103 Which has the lowest energy: Cs137,I125, F18, Pd103?
8.30 MeV The average energy of a 25 MV photon beam is
Z^2 Pair production is proportional to Z in what way?
10% Prior to a prostate seed implant a sample of the seeds needs to be sampled for a
calibration check. What is the required sampling?
<10% Identify the V20 for lungs for SBRT
5000cGy Pathologic fracture of the ribs can occur at what dose?
</= 0.005 uCi What is the radiation safety limit for a sealed source wipe test?
