(a) The licensee shall ensure that the dose equivalent to the embryo/fetus during the entire pregnancy, due to the occupational exposure of a declared pregnant woman, does not exceed 0.5 rem (5 mSv). (For recordkeeping requirements, see § 20.2106.) Show (b) The licensee shall make efforts to avoid substantial variation above a uniform monthly exposure rate to a declared pregnant woman so as to satisfy the limit in paragraph (a) of this section. (c) The dose equivalent to the embryo/fetus is the sum of— (1) The deep-dose equivalent to the declared pregnant woman; and (2) The dose equivalent to the embryo/fetus resulting from radionuclides in the embryo/fetus and radionuclides in the declared pregnant woman. (d) If the dose equivalent to the embryo/fetus is found to have exceeded 0.5 rem (5 mSv), or is within 0.05 rem (0.5 mSv) of this dose, by the time the woman declares the pregnancy to the licensee, the licensee shall be deemed to be in compliance with paragraph (a) of this section if the additional dose equivalent to the embryo/fetus does not exceed 0.05 rem (0.5 mSv) during the remainder of the pregnancy. [56 FR 23396, May 21, 1991, as amended at 63 FR 39482, July 23, 1998] Page Last Reviewed/Updated Wednesday, March 24, 2021 How much radiation is safe for pregnancy?United States Nuclear Regulation Commission (USNRC) also recommends total fetus exposure during pregnancy to be less than 5.0 mSv (500 mrem). The fetus radiation dose below 50 mGy is considered safe and not cause any harm.
What is the limit for radiation exposure?Adult: 5,000 Millirems
The current federal occupational limit of exposure per year for an adult (the limit for a worker using radiation) is "as low as reasonably achievable; however, not to exceed 5,000 millirems" above the 300+ millirems of natural sources of radiation and any medical radiation.
What is the MPD for an occupationally exposed pregnant woman?MPD limits for the occupationally exposed amounts to 20 mSv/yr (new 1998 standard). In comparison, the limit for the general public is 1 mSv/yr, and pregnant women 5mSv/9 months.
What is the most radiosensitive period of pregnancy?The most radiosensitive period for the fetus is during organogenesis, which occurs at weeks 2–8 after conception (4,5).
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The Nuclear Regulatory Commission radiation exposure limit for the full length of a pregnancy is
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