RADIATION SAFETY EXAM STUDY
GUIDE / QUESTIONS AND
CORRECT ANSWERS 2025/2026
GRADED A+ LATEST UPDATE .
, 1. Terrestrial radiation CORRECT ANSWER Natural background radiation that results from the pres- ence of
naturally occurring radioactivity in the soil and earth
2. Cosmic radiation CORRECT ANSWER Natural background radiation that results from the interaction of particles
originating in outer space with the earth's atmosphere
3. Internal Radioactivity CORRECT ANSWER Natural background radiation due to naturally occurring
radionuclides that have been deposited in the human body via either ingestion or inhalation
4. 300 millirem CORRECT ANSWER Average annual effective dose equivalent in the US (200 millirem attributed
to radon gas)
5. Medical radiation CORRECT ANSWER average per capita effective radiation dose equivalent is ap- proximately
53 millirem per year
6. Department of Transport CORRECT ANSWER DOT
7. Occupational safety and Health Administration CORRECT ANSWER OSHA
8. Environmental Protection Agency CORRECT ANSWER EPA
9. Nuclear Regulatory Commission CORRECT ANSWER NRC
10. International Commission on Radiological Protection CORRECT ANSWER ICRP
11. National Council on Radiation Protection and Measurements CORRECT ANSWER NCRP
12. DOT, OSHA, EPA, NRC, ICRP, NCRP CORRECT ANSWER Agencies responsible for radiation safety and
control
13. 5 rems per year CORRECT ANSWER Occupational Dose Limit for effective dose equivalent
14. 15 rems per year CORRECT ANSWER Occupational Dose Limit for Lens of the eyes
15. 50 rems per year CORRECT ANSWER Occupational Dose limit for any organ or tissue
16. .5 rem per gestation period CORRECT ANSWER Occupational dose limit for embryo/fetus of a declared
pregnancy
17. .1 rem per year CORRECT ANSWER General Public dose limit for effective dose equivalent
18. NCRP recommends that the EDE due to work-related exposure not exceed the worker's age in years
CORRECT ANSWER Additional guidelines of NCRP
GUIDE / QUESTIONS AND
CORRECT ANSWERS 2025/2026
GRADED A+ LATEST UPDATE .
, 1. Terrestrial radiation CORRECT ANSWER Natural background radiation that results from the pres- ence of
naturally occurring radioactivity in the soil and earth
2. Cosmic radiation CORRECT ANSWER Natural background radiation that results from the interaction of particles
originating in outer space with the earth's atmosphere
3. Internal Radioactivity CORRECT ANSWER Natural background radiation due to naturally occurring
radionuclides that have been deposited in the human body via either ingestion or inhalation
4. 300 millirem CORRECT ANSWER Average annual effective dose equivalent in the US (200 millirem attributed
to radon gas)
5. Medical radiation CORRECT ANSWER average per capita effective radiation dose equivalent is ap- proximately
53 millirem per year
6. Department of Transport CORRECT ANSWER DOT
7. Occupational safety and Health Administration CORRECT ANSWER OSHA
8. Environmental Protection Agency CORRECT ANSWER EPA
9. Nuclear Regulatory Commission CORRECT ANSWER NRC
10. International Commission on Radiological Protection CORRECT ANSWER ICRP
11. National Council on Radiation Protection and Measurements CORRECT ANSWER NCRP
12. DOT, OSHA, EPA, NRC, ICRP, NCRP CORRECT ANSWER Agencies responsible for radiation safety and
control
13. 5 rems per year CORRECT ANSWER Occupational Dose Limit for effective dose equivalent
14. 15 rems per year CORRECT ANSWER Occupational Dose Limit for Lens of the eyes
15. 50 rems per year CORRECT ANSWER Occupational Dose limit for any organ or tissue
16. .5 rem per gestation period CORRECT ANSWER Occupational dose limit for embryo/fetus of a declared
pregnancy
17. .1 rem per year CORRECT ANSWER General Public dose limit for effective dose equivalent
18. NCRP recommends that the EDE due to work-related exposure not exceed the worker's age in years
CORRECT ANSWER Additional guidelines of NCRP
