<prompt> The recommended monthly limit to the fetus is0.05 mSv0.1 mSv0.5 mSv2 mSv  <response>: The NCRP recommends a monthly limit of 0.5 mSv 50 mrem to the embryo or fetus once a woman declares her pregnancy. In contrast to this, the ICRP recommends a limit of 2 mSv 200 mrem to the surface of the woman;s abdomen lower trunk for the remainder of the pregnancy. These recommendations are essentially similar and are designed to limit the risk of mental retardation, other congenital malformations, and carcinogenesisReference: Eric J Hall Textbook of Radiobiology for Radiologist; 5th edition 