Radiation Protection Flashcards
(26 cards)
How many mrem in a mSv?
1 mSv = 100 mrem
Dose equivalent?
dose x weighting factor
Effective dose equivalent?
Sum of dose equivalents per organ (tissue)
Annual dose from background radiation?
6 mSv/yr
How many mSv in a rem?
10
Annual limit for occupational worker?
50 mSv
Annual limit for occupational worker hands?
500 mSv
Annual limit for occupational worker eye?
50 mGy
Annual limit for general public?
1 mSv
Annual limit for public visiting a person who cannot be released from the hospital?
5 mSv
Annual limit for a child?
1 mSv
Annual limit for the general public eye?
15 mSv
Annual limit for the general public hand?
50 mSv
Annual limit for the general public in an unrestricted area?
0.02 mSv/hr
Monthly limit for declared pregnancy?
0.5 mSv/month
5 mSv for entire pregnancy
Lifetime dose limit?
10 mSv x age
How much dose from a diagnostic CT body?
~10 mSv
Plain radiography ~0.1 mSv
Whole body CT > lower GI series > angiography > CT > upper GI series
What is a reportable medical event?
> 0.05 Sv deviation from effective dose equivalent or >0.5 Sv to organ AND:
> 20% deviation from total dose
OR
50% deviation from single fraction dose
OR
Wrong drug/patient/site/route/treatment mode, or leaking sealed source
How often is a leak test done? What is failure to pass?
Every 6 months
>185 Bq (0.005 uCi)
What is the dose rate for a controlled radiation area?
0.1 mSv/wk
(>2 mrem/hr)
What is the dose rate for a radiation area?
> 5 mrem/hr
What is the dose rate for a high radiation area?
> 100 mrem/hr
What is the dose rate for a very high radiation area?
> 500 mrem/hr
What is a yellow II transportation index?
Surface <50 mR/hr and <1 at 1 meter
White: surface <0.5 mR/hr and undetectable at 1 meter
Yellow III: surface >50 mR/hr OR >1 at 1 meter
