Dosimetry Mock Exam Review Actual
Questions and Answers 2026
It is discovered that a patient receiving 400 cGys daily has been
given 25 fractions at 77 cm SSD instead of 80 cm SSD. Instead of the
prescribed 10,000 cGy, the patient received:
a. 9,264 cGy
b. 9,628 cGy
c. 10.390 cGy
d. 10,794 cGy -
correct answer ✅d. 10,794 cGy
If treating a supine patient isocentrically and assuming there is no
table sag, given a tabletop (Z) of 13.5cm, an anterior SSD of 84cm,
and a 100cm SAD machine, the expected posterior SSD would be?
a. 86.5 cm
b. 84 cm
c. 97.5 cm
d. 103.5 cm -
correct answer ✅a. 86.5 cm
,Dosimetry Mock Exam Review Actual
Questions and Answers 2026
the depth/Dmax dose for a 250 cGy tumor dose if the depth dose
percentage is 96% would be:
a. 240 cGy
b. 260 cGy
c. 300 cGy
d. 350 cGy -
correct answer ✅b. 260 cGy
The calculated treatment time on a cobalt unit is 4.23 minutes. This
treatment time in minutes and seconds is:
a. 4 minutes 23 seconds
b. 4 minutes 30 seconds
c. 4 minutes 14 seconds
d. 4 minutes 19 seconds -
correct answer ✅c. 4 minutes 14 seconds
During verification placement imaging for radioactive needles, the
image receptor is located 120 cm from the source. The 3-inch
, Dosimetry Mock Exam Review Actual
Questions and Answers 2026
needles measure 4.0 cm on the film. How far away were the
needles from the image receptor?
a. 130 cm
b. 120 cm
c. 90 cm
d. 30 cm -
correct answer ✅d. 30 cm
*** Using direct proportions, SAD will equal 90cm. 120cm-90cm =
30cm from the source ***
If there are 168 mCi of Cobalt-60 today, how much activity was
present 8 years ago?
a. 56 mCi
b. 482 mCi
c. 107 mCi
d. 627 mCi -
correct answer ✅b. 482 mCi
Questions and Answers 2026
It is discovered that a patient receiving 400 cGys daily has been
given 25 fractions at 77 cm SSD instead of 80 cm SSD. Instead of the
prescribed 10,000 cGy, the patient received:
a. 9,264 cGy
b. 9,628 cGy
c. 10.390 cGy
d. 10,794 cGy -
correct answer ✅d. 10,794 cGy
If treating a supine patient isocentrically and assuming there is no
table sag, given a tabletop (Z) of 13.5cm, an anterior SSD of 84cm,
and a 100cm SAD machine, the expected posterior SSD would be?
a. 86.5 cm
b. 84 cm
c. 97.5 cm
d. 103.5 cm -
correct answer ✅a. 86.5 cm
,Dosimetry Mock Exam Review Actual
Questions and Answers 2026
the depth/Dmax dose for a 250 cGy tumor dose if the depth dose
percentage is 96% would be:
a. 240 cGy
b. 260 cGy
c. 300 cGy
d. 350 cGy -
correct answer ✅b. 260 cGy
The calculated treatment time on a cobalt unit is 4.23 minutes. This
treatment time in minutes and seconds is:
a. 4 minutes 23 seconds
b. 4 minutes 30 seconds
c. 4 minutes 14 seconds
d. 4 minutes 19 seconds -
correct answer ✅c. 4 minutes 14 seconds
During verification placement imaging for radioactive needles, the
image receptor is located 120 cm from the source. The 3-inch
, Dosimetry Mock Exam Review Actual
Questions and Answers 2026
needles measure 4.0 cm on the film. How far away were the
needles from the image receptor?
a. 130 cm
b. 120 cm
c. 90 cm
d. 30 cm -
correct answer ✅d. 30 cm
*** Using direct proportions, SAD will equal 90cm. 120cm-90cm =
30cm from the source ***
If there are 168 mCi of Cobalt-60 today, how much activity was
present 8 years ago?
a. 56 mCi
b. 482 mCi
c. 107 mCi
d. 627 mCi -
correct answer ✅b. 482 mCi
