CNMT EXAM 1-6 (QUESTIONSBANK) 534 QUESTIONS
2025/26 WITH COMPLETE SOLUTIONS.
1. If one is receiving 20 mR/hr exposure at a distance of 3 m from a source, at
what distance would one received 500 mR/hr exposure?
a. 0.36 cm
b. 0.36 m
c. 60 cm
d. 0.60 cm Answer - c. 60 cm
2. If an area survey reveals an ambient radiation level of 7 mR/hr, which of the
following radioactive signs would be the best choice to display on the door
leading to this area?
a. caution: radioactive materials
b. caution: radiation area
c. caution: high radiation area
d. grave danger: very high radiation area Answer - b. caution: radiation area
3. An ionization chamber if left in integral mode for 10 min and records a total
dose of 3 mR. Which of the following area posting signs should be used on the
door leading to this area?
a. caution: radioactive materials
,b. caution: radiation area
c. caution: high radiation area
d. grave danger: very high radiation area Answer - b. caution: radiation area
4. Which of the following area posting signs would not normally be found in a
hospital?
a. caution: radioactive materials
b. caution: radiation area
c. caution: high radiation area
d. grave danger: very high radiation area Answer - d. grave danger: very high
radiation area
5. Which of the following type of survey instruments would be best to use to
survey a spill for removable contamination in a hot lab area where
radioisotopes are being store?
a. GM detector
b. personal pocket dosimeter
c. dose calibrator with a wipe test
d. well counter with a wipe test Answer - d. well counter with a wipe test
6. Four HVLs reduce the amount of incident radiation exposure to what?
a. 12.5%
b. 6.25%
c. 3.125%
,d. none of the above Answer - b. 6.25%
7. Which of the following is not required to be included in the records of a
radioactive package receipt check in process?
a. name of patient
b. name of radioisotope
c. amount of activity
d. both external and internal wipe checks Answer - a. name of patient
8. A package is reading 2 mR/hr at distance of 2 m, what is the appropriate DOT
label for this package?
a. DOT 1
b. DOT 2
c. DOT 3
d. no labeling is required Answer - b. DOT 2
9. The purpose of the transport index is:
a. to list the final destination of the package
b. to indicate the highest activity of the contents at 1 m from the source
c. not to give emergency personnel information about the contents of the
package in an accident
d. not to list the radioisotopes in the package Answer - b. to indicate the
highest activity of the contents at 1 m from the source
, 10. If a patient who is having a bone scan urinates on the floor next to a
camera, what would be the best course of action to reduce radiation exposure?
a. let the radioactive urine decay to background
b. move the camera away from the spill
c. remove the spill with some absorbent material and cover any residual
activity with a lead plate or lead apron
d. notify the referring physician of a medical event Answer - c. remove the spill
with some absorbent material and cover any residual activity with a lead plate
or lead apron
11. Which DOT radioactive level is entirely white?
a. DOT 1
b. DOT 2
c. DOT 3
d. DOT 4 Answer - a. DOT 1
12. Which absorber would be the best to use to shield strontium-89?
a. cardboard
b. plexiglass
c. lead
d. no shielding required Answer - b. plexiglass
13. Which of the following indicates the amount of radioactive substance
present in a sample or source?
2025/26 WITH COMPLETE SOLUTIONS.
1. If one is receiving 20 mR/hr exposure at a distance of 3 m from a source, at
what distance would one received 500 mR/hr exposure?
a. 0.36 cm
b. 0.36 m
c. 60 cm
d. 0.60 cm Answer - c. 60 cm
2. If an area survey reveals an ambient radiation level of 7 mR/hr, which of the
following radioactive signs would be the best choice to display on the door
leading to this area?
a. caution: radioactive materials
b. caution: radiation area
c. caution: high radiation area
d. grave danger: very high radiation area Answer - b. caution: radiation area
3. An ionization chamber if left in integral mode for 10 min and records a total
dose of 3 mR. Which of the following area posting signs should be used on the
door leading to this area?
a. caution: radioactive materials
,b. caution: radiation area
c. caution: high radiation area
d. grave danger: very high radiation area Answer - b. caution: radiation area
4. Which of the following area posting signs would not normally be found in a
hospital?
a. caution: radioactive materials
b. caution: radiation area
c. caution: high radiation area
d. grave danger: very high radiation area Answer - d. grave danger: very high
radiation area
5. Which of the following type of survey instruments would be best to use to
survey a spill for removable contamination in a hot lab area where
radioisotopes are being store?
a. GM detector
b. personal pocket dosimeter
c. dose calibrator with a wipe test
d. well counter with a wipe test Answer - d. well counter with a wipe test
6. Four HVLs reduce the amount of incident radiation exposure to what?
a. 12.5%
b. 6.25%
c. 3.125%
,d. none of the above Answer - b. 6.25%
7. Which of the following is not required to be included in the records of a
radioactive package receipt check in process?
a. name of patient
b. name of radioisotope
c. amount of activity
d. both external and internal wipe checks Answer - a. name of patient
8. A package is reading 2 mR/hr at distance of 2 m, what is the appropriate DOT
label for this package?
a. DOT 1
b. DOT 2
c. DOT 3
d. no labeling is required Answer - b. DOT 2
9. The purpose of the transport index is:
a. to list the final destination of the package
b. to indicate the highest activity of the contents at 1 m from the source
c. not to give emergency personnel information about the contents of the
package in an accident
d. not to list the radioisotopes in the package Answer - b. to indicate the
highest activity of the contents at 1 m from the source
, 10. If a patient who is having a bone scan urinates on the floor next to a
camera, what would be the best course of action to reduce radiation exposure?
a. let the radioactive urine decay to background
b. move the camera away from the spill
c. remove the spill with some absorbent material and cover any residual
activity with a lead plate or lead apron
d. notify the referring physician of a medical event Answer - c. remove the spill
with some absorbent material and cover any residual activity with a lead plate
or lead apron
11. Which DOT radioactive level is entirely white?
a. DOT 1
b. DOT 2
c. DOT 3
d. DOT 4 Answer - a. DOT 1
12. Which absorber would be the best to use to shield strontium-89?
a. cardboard
b. plexiglass
c. lead
d. no shielding required Answer - b. plexiglass
13. Which of the following indicates the amount of radioactive substance
present in a sample or source?
