Dose Equivalent to an Embryo/Fetus

(A) The licensee or registrant shall ensure that the dose equivalent to an embryo/fetus during the entire pregnancy, due to occupational exposure of a declared pregnant woman, does not exceed five millisieverts (0.5 rems). See 105 CMR 120.267 for recordkeeping requirements. (B) The licensee or registrant 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 105 CMR 120.218(A). (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 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 5.0 mSv (0.5 rem), or is within 0.5 mSv (0.05 rem) of this dose, by the time the woman declares the pregnancy to the licensee or registrant, the licensee or registrant shall be deemed to be in compliance with 105 CMR 120.218(A), if the additional dose to the embryo/fetus does not exceed 0.5 millisievert (0.05 rem) during the remainder of the pregnancy. RADIATION DOSE LIMITS