Safety Flashcards
Within what tolerance do survey instruments need to be maintained to be used clinically?
20% difference between measured and calculated exposure rates
What is the limit for release of individuals containing unsealed byproduct material or implants containing byproduct material?
Total Effective Dose Equivalent (TEDE) to any other individual not to exceed 5 mSv
What defines a Very High radiation area?
> 5 Gy (500 rad) in 1 hr at 1 m from the source or any surface the source penetrates
What defines a High radiation area?
> 1 mSv (0.1 rem) in 1 hr at 30 cm from the source or any surface it penetrates
What defines a Radiation Area?
> 0.05 mSv (5 mrem) in 1 hr at 30 cm from the source or any surface it penetrates
What is the transport index?
Maximum radiation level at 1m from the surface, in units of mrem/hr
What would get a White I shipping label?
<=0.5 mrem/hr at the surface
What would get a Yellow II shipping label?
<=50 mrem/hr at the surface and <=1 mrem/hr at 1m
What would get a Yellow III shipping label?
<200 mrem/hr at the surface and <=10 mrem/hr at 1m
What is the recommended annual limit of whole body dose (TEDE) for radiation workers?
50 mSv/year
What is the recommended annual limit of dose to the eyes for radiation workers?
150 mSv/year
What is the recommended annual limit of dose to the extremities for radiation workers?
500 mSv/year
What is the recommended annual limit of skin dose for radiation workers?
500 mSv/year
What is the recommended monthly dose limit for a declared pregnant worker?
0.5 mSv/month
What is the recommended dose limit to a fetus over the course of gestation?
1/10th the radiation worker limit = 50 mSv/year/10 = 5 mSv
What is the recommended whole-body dose limit (TEDE) for the public?
1 mSv/year AND < 0.02 mSv in any 1 hour
How long should personnel dosimetry records be kept?
Indefinitely
How long should annual calibration records be kept?
Indefinitely
How long should machine maintenance records be kept?
Lifetime of machine
How long should installed source records be kept?
Indefinitely
How long should daily QA records be kept?
3 Years
What is the design goal for shielding a controlled area?
0.1 mSv/week
What is the design goal for shielding an uncontrolled area?
0.02 mSv/week
What is the definition of a medical event?
Total dose differs from prescribed dose by >=20%, fraction dose differs from prescribed fractionated dose by >=50%