Exam (elaborations)
Radiation Safety NMTCB Practice Questions and Answers
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Radiation Safety NMTCB Practice
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Radiation Safety NMTCB PracticeNRC Occupational exposure of Whole body - answer50 msv/year
5 rem/year
NRC Occupational exposure Lens of eye - answer150 msv/year
15 rem/year
NRC Occupational exposure of organ or tissue - answer500 msv/year
50 rem/year
NRC Occupational exposure of skin or extremity - answer500 msv/year
50 rem/year
NRC Occupational exposure of general public - answer1 msv/year
.1 rem/year
NRC Occupational exposure of fetus exposed worker - answer5 msv/year
.5 rem/year
Caution: Radioactive Materials (sign) - answer-Where radioactive materials are used or
stored
-Usually in entrances of labs or depts
Caution: Radiation Area (sign) - answer-Where individual can receive more than .05
msv (5rem) in 1 hour
-Seen in entrances to nuc med labs
Caution: High Radiation Area (sign) - answer-Individual can receive more than 1msv
(100rem) in 1 hour
-Commonly where radiation therapy is performed
Grave Danger: Very High Radiation Area (sign) - answer-Individual can receive an
absorbed dose of more than 5 gy (500rad) in 1 hour
-Not usually in hospital setting
Unrestricted area - answer-Individual can receive less than .02 msv (2rem) in 1 hour
-(example, reception and waiting area)
Inverse square law (distance) - answerBy doubling the distance the radiation dose rate
is reduced to 1/4 of the original
, Inverse square law (distance) equation - answer(Intensity 1)(Density 1)^2=(Intensity 2)
(Density2)^2
DOT White 1 - answer-Surface no more than .5 mR/hr
-1 meter (3ft) no detected radioactivity
DOT Yellow 2 - answer-Surface no more than 50 mR/hr
-1 meter (3ft) no more than 1 mR/hr
DOT Yellow 3 - answer-Surface no more than 200 mR/hr
-1 meter (3ft) no more than 10 mR/hr
Highest amount of the activity which can be counted accurately in the well counter is -
answer10^-6 Ci
What is the maximum acceptable hourly exposure for a radiation occupational worker -
answer2 mR/hr
All packages containing non-gaseous radioactive materials must have a wipe test done.
What is the area to be wiped - answer300cm^2
The annual exposure maximum for an occupational radiation worker - answer50 msv
1msv = ? mrem - answer100
NRC how many years are area survey and wipe records kept? - answer3 years
NRC requires wipe test readings to be in what? - answerdpm
Efficiency of well counter equation - answerefficiency=net cpm/dpm
Film badge - answer-Effective measuring radiation of .1 msv (10rem) to several sieverts
-worn between waist and shoulder
Thermoluminescent Dosimeters - answer-ring badge
-keep out of humidity and high temperature
-contains lithium fluoride
Optically stimulated luminescence dosimeters - answer-resistant to heat, moisture, and
aging
-contains aluminum oxide
Pocket Ionization Chambers - answer-expensive
-immediate radiation measurements
RAD - answer-radiation absorbed dose
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