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1. <correct.opt style="color: rgb(78, 78, 78); font-family: 'Open Sans'; font-size: 15px; line-height: 22.5px;"> According to the NCRP, the annual occupational whole-body dose-equivalent limit is 50 mSv (5 rem or 5,000 mrem). The annual occupational whole-body dose-equivalent limit for students under the age of 18 years is 1 mSv (100 mrem or 0.1 rem). The annual occupational dose-equivalent limit for the lens of the eye, a particularly radiosensitive organ, is 150 mSv (15 rem). The annual occupational dose-equivalent limit for the thyroidskin, and extremities is 500 mSv (50 rem). The total gestational dose-equivalent limit for the embryo/fetus of a pregnant radiographer is 5 mSv (500 mrem), not to exceed 0.5 mSv in 1 month.(Bushong8th ed.p. 557)
2. f the exposure rate to a body standing 5 feet from a radiation source is 10 mR/min, what will be the dose to that body at a distance of 8 feet from the source?

25.6 mR/min

16 mR/min

6.25 mR/min

3.9 mR/min
•
•
• 3.9 mR/min
• The relationship between x-ray intensity and distance from the source is expressed in the inverse square law of radiation. The formula is
• Substituting known values,
• 64 x = 250
• x = 3.9 mR/min at 8 feet from the source
3. The dose limit for 1 month during pregnancy is___ mSv (__mrem,___ rem).
•  0.5mSv
• 50 mren
• 0.05rem
4. What is the established fetal dose-limit guideline for pregnant radiographers during the entire gestation period?
•
•
• 0.5 rem
5. According to the National Council on Radiation Protection and Measurements (NCRP), the gestational dose-equivalent limit for embryo/fetus of a pregnant radiographer is

1 mSv

0.5 mSv

15 mSv

50 mSv
•
•
• 0.5 mSv
 Author: Anonymous ID: 302820 Card Set: Radiation exposure & monitoring Updated: 2015-05-16 23:32:07 Tags: rad Folders: Description: Radiation exposure & monitoring Show Answers: