RADIATION SAFETY AND RADIOBIOLOGY IN
MEDICAL IMAGING EXAM 2026 COMPLETE
QUESTION SET AND CORRECT ANSWERS
GRADED A PLUS
◉ What does ALARA stand for in radiation safety?
Answer: As Low As Reasonably Achievable.
◉ What are the two types of radiation/matter interactions
significant in radiography?
Answer: Photoelectric effect and Compton interaction.
◉ What is the significance of background radiation?
Answer: It accounts for more than half of the exposure the general
public receives.
◉ What is the main source of natural background radiation?
Answer: Radon gas.
◉ What are the two categories of radiation exposure limits?
Answer: Occupational workers and the general public.
,◉ What is the effective dose limit for occupational workers' whole
body exposure?
Answer: 50 mSv.
◉ What is the effective dose limit for the general public for
infrequent exposure?
Answer: 5 mSv.
◉ What organization was established in 1964 to provide
information on radiation protection?
Answer: National Council on Radiation Protection and
Measurements (NCRP).
◉ What does the nonthreshold concept imply regarding radiation
exposure?
Answer: No known level of radiation exposure exists below which
adverse biological effects may not occur.
◉ What is the SI unit for measuring absorbed dose?
Answer: Gray.
◉ What is the SI unit for measuring effective dose?
, Answer: Sievert.
◉ What is the effective dose limit for the lens of the eye for
occupational workers?
Answer: 150 mSv.
◉ What is the effective dose limit for an embryo/fetus during
gestation per month?
Answer: 0.5 mSv.
◉ What is the significance of the photoelectric effect in diagnostic
radiography?
Answer: It is one of the main types of photon interactions that
affects image quality.
◉ What are the primary sources of human-made radiation?
Answer: Medical and dental x-ray exposures, fallout from nuclear
weapons testing, and industrial radioactive materials.
◉ What is the cumulative dose limit for occupational workers based
on age?
Answer: 10 mSv multiplied by age in years.
MEDICAL IMAGING EXAM 2026 COMPLETE
QUESTION SET AND CORRECT ANSWERS
GRADED A PLUS
◉ What does ALARA stand for in radiation safety?
Answer: As Low As Reasonably Achievable.
◉ What are the two types of radiation/matter interactions
significant in radiography?
Answer: Photoelectric effect and Compton interaction.
◉ What is the significance of background radiation?
Answer: It accounts for more than half of the exposure the general
public receives.
◉ What is the main source of natural background radiation?
Answer: Radon gas.
◉ What are the two categories of radiation exposure limits?
Answer: Occupational workers and the general public.
,◉ What is the effective dose limit for occupational workers' whole
body exposure?
Answer: 50 mSv.
◉ What is the effective dose limit for the general public for
infrequent exposure?
Answer: 5 mSv.
◉ What organization was established in 1964 to provide
information on radiation protection?
Answer: National Council on Radiation Protection and
Measurements (NCRP).
◉ What does the nonthreshold concept imply regarding radiation
exposure?
Answer: No known level of radiation exposure exists below which
adverse biological effects may not occur.
◉ What is the SI unit for measuring absorbed dose?
Answer: Gray.
◉ What is the SI unit for measuring effective dose?
, Answer: Sievert.
◉ What is the effective dose limit for the lens of the eye for
occupational workers?
Answer: 150 mSv.
◉ What is the effective dose limit for an embryo/fetus during
gestation per month?
Answer: 0.5 mSv.
◉ What is the significance of the photoelectric effect in diagnostic
radiography?
Answer: It is one of the main types of photon interactions that
affects image quality.
◉ What are the primary sources of human-made radiation?
Answer: Medical and dental x-ray exposures, fallout from nuclear
weapons testing, and industrial radioactive materials.
◉ What is the cumulative dose limit for occupational workers based
on age?
Answer: 10 mSv multiplied by age in years.
