Page 1 of 107
RADIATION THERAPY BOARD EXAM PREP Q.
BANK | {LATEST 2026/ 2027 UPDATE}
COMPLETE ACTUAL AND AUTHENTIC EXAM |
BRAND NEW!
Prophylactic cranial irradiation for ALL is administered to a total dose
of:
A. 1200 cGy
B. 1800 cGy
C. 3000 cGy
D. 4500 cGy
E. 6000 cGy
B. 1800 cGy
If a patient is to be treated at 140 cm SSD on a LINAC and the
treatment field is 22 x 40 at this extended distance. What would be
the required collimator setting?
A. 22 x 40
,Page 2 of 107
B. 16 x 29
C. 11 x 20
D. 8 x 16
B. 16 x 29
22/140 = .157
.157 x 100 SSD = 15.7 = 16
Therefore, the collimator setting is 16 x 29
____ work(s) best with sparsely ionizing radiation by scavenging for
free radicals.
A. Radiosensitizers
B. Radioprotectors
C. Oxygen
D. RBE
B. Radioprotectors
,Page 3 of 107
A dose of 3000 cGy is to be delivered at a depth of 5 cm with a %DD of
85%. What is the applied dose?
A. 3529 cGy
B. 2550 cGy
C. 5550 cGy
D. 6000 cGy
A. 3529 cGy
Use the applied dose formula:
TD/%DD
3000/85% = 3529 cGy
A dose of 4500 cGy is delivered at a depth of 10 cm where the %DD is
62%. What is the dose to an an organ anterior to the target where the
%DD is 72%?
, Page 4 of 107
A. 4950 cGy
B. 4050 cGy
C. 5226 cGy
D. 5676 cGy
C. 5226 cGy
Use direct proportion or solve for the applied dose and multiply by
72%.
4500/62% = 7258
7258 (72%) = 5226 cGy
The percent depth dose is 91.8% for a 10 MV beam with a field size of
12 x 12 at 5 cm depth and 80 cm SSD. Calculate the %DD for the same
field size and depth for 100 cm SSD.
A. 81.5%
B. 83.8%
C. 87.4%
D. 92.9%
RADIATION THERAPY BOARD EXAM PREP Q.
BANK | {LATEST 2026/ 2027 UPDATE}
COMPLETE ACTUAL AND AUTHENTIC EXAM |
BRAND NEW!
Prophylactic cranial irradiation for ALL is administered to a total dose
of:
A. 1200 cGy
B. 1800 cGy
C. 3000 cGy
D. 4500 cGy
E. 6000 cGy
B. 1800 cGy
If a patient is to be treated at 140 cm SSD on a LINAC and the
treatment field is 22 x 40 at this extended distance. What would be
the required collimator setting?
A. 22 x 40
,Page 2 of 107
B. 16 x 29
C. 11 x 20
D. 8 x 16
B. 16 x 29
22/140 = .157
.157 x 100 SSD = 15.7 = 16
Therefore, the collimator setting is 16 x 29
____ work(s) best with sparsely ionizing radiation by scavenging for
free radicals.
A. Radiosensitizers
B. Radioprotectors
C. Oxygen
D. RBE
B. Radioprotectors
,Page 3 of 107
A dose of 3000 cGy is to be delivered at a depth of 5 cm with a %DD of
85%. What is the applied dose?
A. 3529 cGy
B. 2550 cGy
C. 5550 cGy
D. 6000 cGy
A. 3529 cGy
Use the applied dose formula:
TD/%DD
3000/85% = 3529 cGy
A dose of 4500 cGy is delivered at a depth of 10 cm where the %DD is
62%. What is the dose to an an organ anterior to the target where the
%DD is 72%?
, Page 4 of 107
A. 4950 cGy
B. 4050 cGy
C. 5226 cGy
D. 5676 cGy
C. 5226 cGy
Use direct proportion or solve for the applied dose and multiply by
72%.
4500/62% = 7258
7258 (72%) = 5226 cGy
The percent depth dose is 91.8% for a 10 MV beam with a field size of
12 x 12 at 5 cm depth and 80 cm SSD. Calculate the %DD for the same
field size and depth for 100 cm SSD.
A. 81.5%
B. 83.8%
C. 87.4%
D. 92.9%
