Dose Limits

Question 1

Total Effective Dose Equivalent (TEDE)

Answer 1

5 Rem (50 mSv)

Question 2

Organ

Answer 2

50 Rem (500 mSv)

Question 3

Eye

Answer 3

15 Rem (150 mSv)

Question 4

Extremity

Answer 4

50 Rem (500 mSv)

Question 5

Minors

Answer 5

500 mRem (5 mSv)

Question 6

Fetus

Answer 6

500 mRem (5 mSv)

Question 7

Public exposure

Answer 7

100 mRem (1 mSv)

Question 8

Public dose rate

Answer 8

2 mR/hr

Question 9

Cumulative

Answer 9

1 rem X age

Question 10

When is the fetus most sensitive

Answer 10

Time of gestation (1st trimester 0-12 weeks)

Question 11

Dose to fetus risk of mental disability

Answer 11

< 5 Rem - little risk

> 15 Rem - High risk

Question 12

NRC and State Regulatory limits for dose during gestation period:

Answer 12

500 mRem / 5mSv

Question 13

If T = 1, than allowed public dose rate can equal _____?

Answer 13

2 mR/hr

Question 14

If T = 0.1, than allowed public dose rate can equal _____?

Answer 14

20 mR/hr

* 2 mR/hr / 0.1 = 20 mR/hr

Question 15

If T = 0.5, than allowed public dose rate can equal _____ ?

Answer 15

4 mR/hr

*2 mR/hr / 0.5 = 4 mR/hr

Question 16

At what dose rate is ALARA Level 1, and what procedure follows?

Answer 16

125 mRem/Qr; if exceeded, report to RSC committee meeting

Question 17

At what dose rate is ALARA Level 2, and what procedure follows?

Answer 17

375 mRem/Qr; if exceeded, investigate, monitor, and report to RSC meeting

Question 18

What department of hospital typically has the most exposure, what is the range?

Answer 18

Cardiac Cath lab; 1100 to 1400 mRem

Question 19

What is considered a “Radiation Area”

Answer 19

5 mRem in 1 hr @ 30cm

Question 20

What is considered a “High Radiation Area”

Answer 20

100 mRem in 1 hr @ 30cm

Question 21

What is considered a “Very High Radiation Area”

Answer 21

500 rads in 1 hr @ 30cm

Question 22

At what dose rate/Activity can a patient be released after Thyroid Ablation?

Answer 22

< 5 mRem/hr @ 1 meter;

< 30 mCi

Question 23

What is the allowable dose rate for Co-60

Answer 23

10 mR/hr - max 1 at 1 meter