NMTCB Study Guide Exam 2026
Questions and Answers
3 major federal agencies that control use of radioactive materials in NM - Correct
answer-NRC
DOT
FDA
DOT I (white) - Correct answer-At contact no more than 0.5 mR/hr
At 3ft no detected radioactivity
DOT II (yellow) - Correct answer-Contact = no more than 50 mR/hr
3ft = no more than 1 mR/hr
DOT III (yellow) - Correct answer-Contact = no more than 200 mR/hr
3ft = no more than 10 mR/hr
Total dose calculation - Correct answer-Total dose = (dose rate)(time)
Inverse square law - Correct answer-(Intensity1 x Distance1)^2 = (I2)(D2)^2
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, Occupational exposure: Whole-body - Correct answer-50 mSv or 5 rem /year
Occupational exposure: Lens of eye - Correct answer-150 mSv or 15 rem /year
Occupational exposure: Any organ or tissue - Correct answer-500 mSv or 50 rem
/year
Occupational exposure: Skin or any extremity - Correct answer-500 mSv or 50 rem
/year
Exposure for general public - Correct answer-1 mSv or 0.1 rem /year
Exposure for embryo/fetus of occupationally exposed worker - Correct answer-5
mSv or 0.5 rem for entire pregnancy
Caution: radioactive materials - Correct answer-Any area w/RA materials
Entrances to lab and department
Potential presence of radiation sources/contamination
No eating or drinking in area
No smoking or applying cosmetics in area
Caution: radiation area - Correct answer-Areas you could receive more than 0.05
mSv (5 mrem) in 1 hour at 30 cm from source
Commonly seen at NM lab entrances
©COPYRIGHT 2025, ALL RIGHTS RESERVED 2
Questions and Answers
3 major federal agencies that control use of radioactive materials in NM - Correct
answer-NRC
DOT
FDA
DOT I (white) - Correct answer-At contact no more than 0.5 mR/hr
At 3ft no detected radioactivity
DOT II (yellow) - Correct answer-Contact = no more than 50 mR/hr
3ft = no more than 1 mR/hr
DOT III (yellow) - Correct answer-Contact = no more than 200 mR/hr
3ft = no more than 10 mR/hr
Total dose calculation - Correct answer-Total dose = (dose rate)(time)
Inverse square law - Correct answer-(Intensity1 x Distance1)^2 = (I2)(D2)^2
©COPYRIGHT 2025, ALL RIGHTS RESERVED 1
, Occupational exposure: Whole-body - Correct answer-50 mSv or 5 rem /year
Occupational exposure: Lens of eye - Correct answer-150 mSv or 15 rem /year
Occupational exposure: Any organ or tissue - Correct answer-500 mSv or 50 rem
/year
Occupational exposure: Skin or any extremity - Correct answer-500 mSv or 50 rem
/year
Exposure for general public - Correct answer-1 mSv or 0.1 rem /year
Exposure for embryo/fetus of occupationally exposed worker - Correct answer-5
mSv or 0.5 rem for entire pregnancy
Caution: radioactive materials - Correct answer-Any area w/RA materials
Entrances to lab and department
Potential presence of radiation sources/contamination
No eating or drinking in area
No smoking or applying cosmetics in area
Caution: radiation area - Correct answer-Areas you could receive more than 0.05
mSv (5 mrem) in 1 hour at 30 cm from source
Commonly seen at NM lab entrances
©COPYRIGHT 2025, ALL RIGHTS RESERVED 2
