Radiation Safety Exam NMTCB
Wipe test for Removable Contamination - ANSWER-Must be analyzed in well counter or uncollimated gamma camera Notify RSO at 22,000 dpm.Records kept for 3 years
Minor Spill procedure - ANSWER-Notify personnel Contain Decontaminate Survey Use absorbent paper and shielding to cover area with RAM label Report Spill
Major Spill Procedure - ANSWER-Clear area Notify personnel Place absorbent paper to prevent spread DO NOT CLEAN Limit movement of those involved to prevent spread Remove contaminated clothing Evacuate, close and secure doors and entries Notify RSO—cleanup conducted under RSO supervision Decontaminate personnel
Equation for exposure after HVL added - ANSWER-Intensity=intensity(original)e^- (0.693)(x/HVL) x = the thickness of the shielding material
NRC Regs are based on - ANSWER-Risk-informed, performance based approach in which the NRC will not, for the most part, specify exactly what methods must be used or how frequently radiation safety procedures must be performed. The licensee must develop policies and procedures that ensure NRC requirements are met.
Whole-body TEDE - ANSWER-5rem or 50mSv per year
Lens of eye - ANSWER-15rem or 150mSv per year
Organ Tissue dose - ANSWER-50rem or 500mSv per year
General public dose - ANSWER-0.1rem or 1mSv per year
Embryo/fetal dose - ANSWER-0.5rem or 5mSv for entire pregnancy
- / 2
Unrestricted area - ANSWER-Anyone in area will receive less than 2mrem or 0.02mSv in any 1 hour.
Caution: Radiation Area - ANSWER-Individual receives more than 5mrem (0.05mSv) in
- hr at 30cm from source.
High Radiation Area - ANSWER-100mrem (1mSv) in 1hr at 30cm from source
Very High Radiation Area - ANSWER-An individual could receive an absorbed dose greater than 500 rads or 500 cGy or 5 Gy in one hour at one meter from the radiation source.
accelerator produced radionuclides - ANSWER-I-123 Ga-67 Tl-201 In-111
Reactor produced radionuclides - ANSWER-Mo-99/Tc-99m I-131 I-125 Xe-133 Cr-51 Sr-89 Sm-153 P-32
Total radiation dose based on length of exposure - ANSWER-Total dose=(dose rate)(time)
Inverse Square Law - ANSWER-(Intensity 1)(Distance 1)^2=(Intensity 2)(Distance 2)^2
Half-value layer HVL - ANSWER-Thickness of material required to reduce radiation intensity to half its original value.
Receipt of RAM - ANSWER-All shipments display radioactive label Wipe tested Surveyed at 1 meter Packages monitored within 3 hours of receipt, or if delivered after hours, within 3 hours of dept reopening
When should NRC and shipment carrier be notified of excessive exposure rate? - ANSWER-If rate exceeds 200mR/hr at surface and 10mR/he at 1 meter.If removable contamination (wipe) exceeds 22 dpm per cm^2
Equation for dpm - ANSWER-Dpm=net cpm/efficiency of well counter
- / 2