NMTCB REVIEW QUESTIONS AND ANSWERS 100% CORRECTNMTCB REVIEW QUESTIONS AND ANSWERS 100% CORRECTNMTCB REVIEW QUESTIONS AND ANSWERS 100% CORRECT
NRC - ANSWER-Nuclear Regulatory Commission
DOT - ANSWER-Department of Transportation
Type A Packaging - ANSWER-Adequate for normal transport
Type B...
Shielding for alpha particles - ANSWER-Sheet of paper
Shielding for beta particles - ANSWER-Plastic or lucite
Why should lead shielding not be used for beta emitters? - ANSWER-Creates
bremmstrahlung
Bremsstrahlung - ANSWER-Radiation resulting from deceleration of beta particles as
they approach the nuclei of the lead atoms-released as x rays
HVL - ANSWER-Half value layer
The amount of bremsstrahlung _____________ with the density of the material that the
beta particles pass - ANSWER-Increases
Half value layer - ANSWER-The thickness of a material required to reduce the radiation
intensity to half its original value
Energy of positron emitters - ANSWER-511 keV
When are film badges affective? - ANSWER-When measuring radiation exposures of 10
mrem to several hundred rem
What is a film badge made of? - ANSWER-3 or 4 filters of different material (lead,
copper, aluminum, plastic)
TLD - ANSWER-Thermolumimescent dosimeters
Dpm limit for wipe testing for package receipt - ANSWER-22 dpm/cm^2 (6600 dpm/300
cm^2)
How long does a radioactive material generally need to be stored? - ANSWER-At least
10 half lives
Trigger level for restricted areas for area surveys - ANSWER-5 mrem/hr
Trigger level for unrestricted areas for area surveys - ANSWER-0.2 mrem/hr
How long do area surveys and wipe tests need to be retained? - ANSWER-3 years
When should the RSO be notified during wipe testing? - ANSWER-If more than 22 dpm
per cm^2
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