RTBC Radiation Protection Exam
Questions With All Correct Answers 2025
The primary purpose of the ALARA principle in diagnostic imaging is to: -
ANSWER✔✔-Reduce radiation dose to occupational workers
A radiation worker received a radiation dose of 5 milligrays (mGy) while participating
in a fluoroscopy procedure for 10 minutes. What radiation dose would have been
received by the worker if they reduced their time in the radiation field to only 5
minutes? - ANSWER✔✔-2.5 mGy
Which Cardinal rule of radiation protection is mathematically defined by the inverse
square law? - ANSWER✔✔-Distance
In order to reduce a technologist's occupational dose during a portable radiograph of
the chest, the technologist should: - ANSWER✔✔-Stand several feet away from the
patient during the exposure
During a surgical procedure using three (3) minutes of fluoroscopy time, a radiographer
receives an effective dose of 1 millisievert (mSv). What effective dose would be
COPYRIGHT © 2025 BY OLIVIA GREENWAYS, ALL RIGHTS RESERVED 1
, experienced by the radiographer if the fluoroscopy time is doubled? - ANSWER✔✔-2
mSv
A radiographer is exposed to a dose rate of 10 mSv/hour while standing 3 feet from the
patient during c-arm procedures. What is the approximate dose rate if the radiographer
stands 4 feet from the patient? - ANSWER✔✔-5.6 mSv/hour
A radiologist receives an equivalent dose of 100 μSv while standing 25 cm from a
patient during a fluoroscopy procedure. Estimate the equivalent dose if the radiologist
stood at 10 cm from the patient. - ANSWER✔✔-625 μSv
Which three of the following properties of lead make it a valuable material for radiation
shielding devices? (Select three) - ANSWER✔✔-- High atomic number
- High mass density
- High attenuation
Which of the following materials requires the smallest half-value layer (HVL) to
effectively attenuation the x-ray beam? - ANSWER✔✔-Lead
How does radiation dose change if a technologist increases their distance from a
radiation source by a factor of 2? - ANSWER✔✔-Dose decreases by a factor of 2 squared
A half-value layer (HVL) is the thickness of material required to reduce which of the
following by half? - ANSWER✔✔-X-ray beam intensity
COPYRIGHT © 2025 BY OLIVIA GREENWAYS, ALL RIGHTS RESERVED 2
Questions With All Correct Answers 2025
The primary purpose of the ALARA principle in diagnostic imaging is to: -
ANSWER✔✔-Reduce radiation dose to occupational workers
A radiation worker received a radiation dose of 5 milligrays (mGy) while participating
in a fluoroscopy procedure for 10 minutes. What radiation dose would have been
received by the worker if they reduced their time in the radiation field to only 5
minutes? - ANSWER✔✔-2.5 mGy
Which Cardinal rule of radiation protection is mathematically defined by the inverse
square law? - ANSWER✔✔-Distance
In order to reduce a technologist's occupational dose during a portable radiograph of
the chest, the technologist should: - ANSWER✔✔-Stand several feet away from the
patient during the exposure
During a surgical procedure using three (3) minutes of fluoroscopy time, a radiographer
receives an effective dose of 1 millisievert (mSv). What effective dose would be
COPYRIGHT © 2025 BY OLIVIA GREENWAYS, ALL RIGHTS RESERVED 1
, experienced by the radiographer if the fluoroscopy time is doubled? - ANSWER✔✔-2
mSv
A radiographer is exposed to a dose rate of 10 mSv/hour while standing 3 feet from the
patient during c-arm procedures. What is the approximate dose rate if the radiographer
stands 4 feet from the patient? - ANSWER✔✔-5.6 mSv/hour
A radiologist receives an equivalent dose of 100 μSv while standing 25 cm from a
patient during a fluoroscopy procedure. Estimate the equivalent dose if the radiologist
stood at 10 cm from the patient. - ANSWER✔✔-625 μSv
Which three of the following properties of lead make it a valuable material for radiation
shielding devices? (Select three) - ANSWER✔✔-- High atomic number
- High mass density
- High attenuation
Which of the following materials requires the smallest half-value layer (HVL) to
effectively attenuation the x-ray beam? - ANSWER✔✔-Lead
How does radiation dose change if a technologist increases their distance from a
radiation source by a factor of 2? - ANSWER✔✔-Dose decreases by a factor of 2 squared
A half-value layer (HVL) is the thickness of material required to reduce which of the
following by half? - ANSWER✔✔-X-ray beam intensity
COPYRIGHT © 2025 BY OLIVIA GREENWAYS, ALL RIGHTS RESERVED 2
