(a) The licensee shall ensure that the dose to an embryo/fetus during the entire pregnancy, due to occupational exposure of a declared pregnant woman, does not exceed 0.5 rem (5 millisieverts). See §336.346 of this title (relating to Records of Individual Monitoring Results) for recordkeeping requirements.
(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 subsection (a) of this section. (The National Council on Radiation Protection and Measurements recommended in NCRP Report No. 91, "Recommendations on Limits for Exposure to Ionizing Radiation" (June 1, 1987), that no more than 0.05 rem (0.5 millisievert) to the embryo/fetus be received in any one month.)
(c) The dose to an embryo/fetus shall be taken as the sum of:
  (1) the deep-dose equivalent to the declared pregnant woman; and
  (2) the dose 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 millisieverts) or is within 0.05 rem (0.5 millisievert) of this dose, by the time the woman declares the pregnancy to the licensee, the licensee shall be deemed to be in compliance with subsection (a) of this section if the additional dose equivalent to the embryo/fetus does not exceed 0.05 rem (0.5 millisievert) during the remainder of the pregnancy.

Source Note: The provisions of this §336.312 adopted to be effective June 5, 1997, 22 TexReg 4588; amended to be effective August 30, 2001, 26 TexReg 6309