A number of studies indicate that the risks associated with radiation exposure to the embryo/fetus are greater than those to adults (see NRC Reg Guide 8.13 in Appendix CC). In keeping with this information, the NRC has established a regulatory limit of 500 mrem to the embryo/fetus of a "declared pregnant woman" for the entire gestation period. In addition, this dose must be distributed evenly throughout the gestation period (i.e., approximately 50 mrem per month). Pregnant women who are occupationally exposed to radiation have the option to "declare" their pregnancy by completing an A-7, Notice of Pregnancy, form. When pregnancy is declared, the RSO will review any previous exposures the employee may have received as well as the potential for future exposures during the pregnancy. Based upon the review, the RSO will provide specific recommendations and/or implement any additional precautions. If the pregnant employee does not declare pregnancy, the exposure limits for occupational radiation users apply.