NMTCB Study Guide - Questions & Complete
Solutions
3 major federal agencies that control use of radioactive materials
in NM Correct Ans - NRC
DOT
FDA
DOT I (white) Correct Ans - At contact no more than 0.5
mR/hr
At 3ft no detected radioactivity
DOT II (yellow) Correct Ans - Contact = no more than 50
mR/hr
3ft = no more than 1 mR/hr
DOT III (yellow) Correct Ans - Contact = no more than
200 mR/hr
3ft = no more than 10 mR/hr
Total dose calculation Correct Ans - Total dose = (dose
rate)(time)
Inverse square law Correct Ans - (Intensity1 x
Distance1)^2 = (I2)(D2)^2
Occupational exposure: Whole-body Correct Ans - 50 mSv
or 5 rem /year
Occupational exposure: Lens of eye Correct Ans - 150 mSv
or 15 rem /year
Occupational exposure: Any organ or tissue Correct Ans -
500 mSv or 50 rem /year
Occupational exposure: Skin or any extremity Correct Ans -
500 mSv or 50 rem /year
