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
, 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
1 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
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
, 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
1 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
