Dose Limits Flashcards
Total Effective Dose Equivalent (TEDE)
5 Rem (50 mSv)
Organ
50 Rem (500 mSv)
Eye
15 Rem (150 mSv)
Extremity
50 Rem (500 mSv)
Minors
500 mRem (5 mSv)
Fetus
500 mRem (5 mSv)
Public exposure
100 mRem (1 mSv)
Public dose rate
2 mR/hr
Cumulative
1 rem X age
When is the fetus most sensitive
Time of gestation (1st trimester 0-12 weeks)
Dose to fetus risk of mental disability
< 5 Rem - little risk
> 15 Rem - High risk
NRC and State Regulatory limits for dose during gestation period:
500 mRem / 5mSv
If T = 1, than allowed public dose rate can equal _____?
2 mR/hr
If T = 0.1, than allowed public dose rate can equal _____?
20 mR/hr
* 2 mR/hr / 0.1 = 20 mR/hr
If T = 0.5, than allowed public dose rate can equal _____ ?
4 mR/hr
*2 mR/hr / 0.5 = 4 mR/hr
At what dose rate is ALARA Level 1, and what procedure follows?
125 mRem/Qr; if exceeded, report to RSC committee meeting
At what dose rate is ALARA Level 2, and what procedure follows?
375 mRem/Qr; if exceeded, investigate, monitor, and report to RSC meeting
What department of hospital typically has the most exposure, what is the range?
Cardiac Cath lab; 1100 to 1400 mRem
What is considered a “Radiation Area”
5 mRem in 1 hr @ 30cm
What is considered a “High Radiation Area”
100 mRem in 1 hr @ 30cm
What is considered a “Very High Radiation Area”
500 rads in 1 hr @ 30cm
At what dose rate/Activity can a patient be released after Thyroid Ablation?
< 5 mRem/hr @ 1 meter;
< 30 mCi
What is the allowable dose rate for Co-60
10 mR/hr - max 1 at 1 meter
