MDCB REVIEW QUESTIONS AND
ANSWERS 100% VERIFIED
1625 yr - ANSWER-Ra-226 half life
3.8 d - ANSWER-Rn-222 half life
5.3y - ANSWER-Co-60 half life
30y - ANSWER-Cs-137 half life
74 d - ANSWER-Ir-192 hald life
27 d - ANSWER-Au-198 half life
60d - ANSWER-I-125 half lfie
17d - ANSWER-Pd-103 half life
8d - ANSWER-I-131 half life
13GY - ANSWER-Spinal cord Dmax SRS 1 fx
12mm Pb - ANSWER-Ra-226 HVL
12 mmPb - ANSWER-Rn-222 HVL
11 mmPb - ANSWER-Co-60 HVL
5.5 mmPb - ANSWER-Cs-137 HVL
2.5 mmPb - ANSWER-Ir-192 HVL
2.5 mmPb - ANSWER-Au-198 HVL
0.025 mmPb - ANSWER-I-125 HVL
0.008 mmPb - ANSWER-Pd-103 HVL
E/3.2 - ANSWER-D90
E/2.8 - ANSWER-D80
,<10% - ANSWER-V20 for lungs for SBRT
<12.5Gy - ANSWER-Brainstem SRS 1 fx Dmax
target, Primary collimator, flattening filter, dose chambers, secondary collimator -
ANSWER-What is the correct order of components in treatment head to generate x-
rays?
6Mv - ANSWER-Which linac energy requires the highest beam current
Leukemia - ANSWER-Which is considered a stochastic effect?
Cataracts, Erythema, Sterility, Leukemia
Slightly greater - ANSWER-The lateral penumbra of a proton field is ______ as
compared to a photon field.
55Gy - ANSWER-What is the ideal dose limit to 0.03cc of the brainstem?
Depth, FS, E - ANSWER-TMR are dependent on what?
Co-60, Teletherapy, GammaKnife, HDR, Prostate Seed Implant - ANSWER-List in order
amount of activity from highest to lowest:
HDR, Co-60, Teletherapy, GammaKnife, Prostate Seed Implant
RX isodose Volume/PTV Volume - ANSWER-Conformity Index
<10% - ANSWER-Heart V25
D2 - ANSWER-Maximum total dose in Gy to any point 2cm or greater away from the
PTV in any direction
V12<5-10cc - ANSWER-Brain volume SRS 1 fx
2mm; 1 degree - ANSWER-TG-142 suggests monthly QA tolerances for lateral,
longitudinal, and rotational couch positions for IMRT to be
2mm, 1% on a side - ANSWER-TG-142 suggests monthly QA tolerances for
mechanical/light field coincidence for IMRT to be
2% - ANSWER-TG-142 suggests monthly QA tolerances for electron output constancy
for IMRT to be
R50 - ANSWER-the ratio of the volume of 50% of the prescription dose isodose to the
volume of the PTV
, 2mm - ANSWER-TG-40 suggests daily QA tolerances for laser localization for
simulators to be
2mm - ANSWER-TG-40 suggests annual QA for medical accelerator tolerances for
gantry rotation isocenter to be
<32% - ANSWER-Kidney V20
E, FS, d, SSD - ANSWER-PDD is dependent on
E, FS, d - ANSWER-TMR is dependent on
3.7 x 10^10 Bq - ANSWER-1 Ci =? Bq
10^6 - ANSWER-mega (M)
alpha particle, 1MV, 250kVp, Co-60 - ANSWER-Rank LET from highest to lowest: 1MV,
alpha particle, 250kVp, Co-60
1mSv - ANSWER-100mrad = ? dose equivalent
<12 Gy - ANSWER-Optic Nerve/Chiasm SRS 1 fx Dmax
Dscatter/Dair under SAD conditions - ANSWER-SAR is defined by
the pelvic sidewall/obturator nodes - ANSWER-The location of point B in a T&O
procedure is
(273.2 + T / 295)(760/P) - ANSWER-Temp/Press correction formula
slightly greater - ANSWER-The surface dose for a proton field is _______ as compared
to a photon field.
Linac QA - ANSWER-TG142 is a document that gives recommendations on what?
Prostate - ANSWER-Cs-131 is mostly common used in brachytherapy for which kind of
treatment?
1 - ANSWER-The QF for electron is:
a portion of the target is not covered by the RX dose - ANSWER-A Conformity Index of
<1.0 means what?
Brainstem - ANSWER-Which of the following would be considered a serial structure?
Parotid gland, Brainstem, Heart, Lung
ANSWERS 100% VERIFIED
1625 yr - ANSWER-Ra-226 half life
3.8 d - ANSWER-Rn-222 half life
5.3y - ANSWER-Co-60 half life
30y - ANSWER-Cs-137 half life
74 d - ANSWER-Ir-192 hald life
27 d - ANSWER-Au-198 half life
60d - ANSWER-I-125 half lfie
17d - ANSWER-Pd-103 half life
8d - ANSWER-I-131 half life
13GY - ANSWER-Spinal cord Dmax SRS 1 fx
12mm Pb - ANSWER-Ra-226 HVL
12 mmPb - ANSWER-Rn-222 HVL
11 mmPb - ANSWER-Co-60 HVL
5.5 mmPb - ANSWER-Cs-137 HVL
2.5 mmPb - ANSWER-Ir-192 HVL
2.5 mmPb - ANSWER-Au-198 HVL
0.025 mmPb - ANSWER-I-125 HVL
0.008 mmPb - ANSWER-Pd-103 HVL
E/3.2 - ANSWER-D90
E/2.8 - ANSWER-D80
,<10% - ANSWER-V20 for lungs for SBRT
<12.5Gy - ANSWER-Brainstem SRS 1 fx Dmax
target, Primary collimator, flattening filter, dose chambers, secondary collimator -
ANSWER-What is the correct order of components in treatment head to generate x-
rays?
6Mv - ANSWER-Which linac energy requires the highest beam current
Leukemia - ANSWER-Which is considered a stochastic effect?
Cataracts, Erythema, Sterility, Leukemia
Slightly greater - ANSWER-The lateral penumbra of a proton field is ______ as
compared to a photon field.
55Gy - ANSWER-What is the ideal dose limit to 0.03cc of the brainstem?
Depth, FS, E - ANSWER-TMR are dependent on what?
Co-60, Teletherapy, GammaKnife, HDR, Prostate Seed Implant - ANSWER-List in order
amount of activity from highest to lowest:
HDR, Co-60, Teletherapy, GammaKnife, Prostate Seed Implant
RX isodose Volume/PTV Volume - ANSWER-Conformity Index
<10% - ANSWER-Heart V25
D2 - ANSWER-Maximum total dose in Gy to any point 2cm or greater away from the
PTV in any direction
V12<5-10cc - ANSWER-Brain volume SRS 1 fx
2mm; 1 degree - ANSWER-TG-142 suggests monthly QA tolerances for lateral,
longitudinal, and rotational couch positions for IMRT to be
2mm, 1% on a side - ANSWER-TG-142 suggests monthly QA tolerances for
mechanical/light field coincidence for IMRT to be
2% - ANSWER-TG-142 suggests monthly QA tolerances for electron output constancy
for IMRT to be
R50 - ANSWER-the ratio of the volume of 50% of the prescription dose isodose to the
volume of the PTV
, 2mm - ANSWER-TG-40 suggests daily QA tolerances for laser localization for
simulators to be
2mm - ANSWER-TG-40 suggests annual QA for medical accelerator tolerances for
gantry rotation isocenter to be
<32% - ANSWER-Kidney V20
E, FS, d, SSD - ANSWER-PDD is dependent on
E, FS, d - ANSWER-TMR is dependent on
3.7 x 10^10 Bq - ANSWER-1 Ci =? Bq
10^6 - ANSWER-mega (M)
alpha particle, 1MV, 250kVp, Co-60 - ANSWER-Rank LET from highest to lowest: 1MV,
alpha particle, 250kVp, Co-60
1mSv - ANSWER-100mrad = ? dose equivalent
<12 Gy - ANSWER-Optic Nerve/Chiasm SRS 1 fx Dmax
Dscatter/Dair under SAD conditions - ANSWER-SAR is defined by
the pelvic sidewall/obturator nodes - ANSWER-The location of point B in a T&O
procedure is
(273.2 + T / 295)(760/P) - ANSWER-Temp/Press correction formula
slightly greater - ANSWER-The surface dose for a proton field is _______ as compared
to a photon field.
Linac QA - ANSWER-TG142 is a document that gives recommendations on what?
Prostate - ANSWER-Cs-131 is mostly common used in brachytherapy for which kind of
treatment?
1 - ANSWER-The QF for electron is:
a portion of the target is not covered by the RX dose - ANSWER-A Conformity Index of
<1.0 means what?
Brainstem - ANSWER-Which of the following would be considered a serial structure?
Parotid gland, Brainstem, Heart, Lung
