| (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.
|
