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Formulas & Numbers to remember - NMTCB Questions and Answers 2024
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Formulas & Numbers to remember - NMTCB
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Formulas & Numbers to remember -NMTCB
Occupational exposure limits and total effective dose equivalent
Whole body aka TEDE - answer5 rem (50 mSv)/year
Occupational exposure limits and total effective dose equivalent
Skin or any extremity and TEDE - answer50 rem (500 mSv)/year
Occupational exposure limits and shallow dose equivalent.
Any organ or tissue and SDE - answer50 rem (500 mSv)/year
Occupational exposure limits and lens dose equivalent
Lens of eye LDE - answer15 rem (150 mSv)/year
(Occupational exposure limits)
Fetus of radiation worker - answer0.5 rem (5 mSv)/year
(General public exposure limits)
Whole body - answer0.1 rem (1 mSv)/year
Radioactive I (white) - answer0.5 mR/h
(No detectable radiation aka NDR)
Radioactive II (yellow) - answer50 mR/h at 1 m
Radioactive III (yellow) - answer200 mR/h at 1 m no more than 10 mR/h
Caution: Radioactive Materials - answerPosted in area where radioactive materials are
stored and exceed the limit of *2 mR/h* (millirem per hour) or *0.02 mSv/h* (millisievert
per hour).
This is usually used in work areas and nuclear med labs.
Caution: Radiation Area - answerPosted where one can receive more than *5 mR/h*
(0.05 mSv) at *30 cm*
Caution: High Radiation Area - answerMore than *100mR/h* (1 mSV) at 30 cm from
source
, Usually where Radiation therapy is performed.
Grave Danger: Very High Radiation Area - answermore than *500 rads* (5 grays) in 1 h
at 1m.
Not used in hospitals
Size of the MAA particles should be _____ and recommended particles for adult dose is
_____ - answer10 - 90 um
200,000 - 700,000
Sulfur colloid particles for the liver-spleen scan should be at size ____ um - answer0.01-
1 μm
Tl 201 half life and energy - answer73 hrs
68, 81 keV
decays by electron capture
Accelerator produced (cyclotron)
In-111 half life - answer2.83 days
173, 247
Accelerator Produced
Xe 133 half life - answer5.3 days
81 keV
Reactor Produced
F18 half life - answer110 minutes
511 keV
Accelerator Produced (accelerator is cyclotron)
Co-57 half life - answer270 days
122 keV
I-123: half life and energy - answer13.2 hours
159 keV
Accelerator Produced
I-125 half life - answer60 days
35 keV
Reactor produced
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