<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 thyroid, skin, 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.(Bushong, 8th ed., p. 557)
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
The dose limit for 1 month during pregnancy is___ mSv (__mrem,___ rem).
0.5mSv
50 mren
0.05rem
What is the established fetal dose-limit guideline for pregnant radiographers during the entire gestation period?
0.5 rem
According to the National Council on Radiation Protection and Measurements (NCRP), the gestational dose-equivalent limit for embryo/fetus of a pregnant radiographer is