What is the fetal dose limit for radiation exposure?

The fetal dose limit for radiation exposure during the entire gestation period is established to protect the developing fetus from potential harmful effects of ionizing radiation. The established limit of 500 mRem (or 5 mSv) is based on research and guidelines provided by various health organizations, including the National Council on Radiation Protection and Measurements (NCRP) and the International Commission on Radiological Protection (ICRP).

This limit is considered sufficient to reduce the risk of radiation-induced developmental abnormalities and other long-term effects while allowing for some exposure in medically necessary situations. The focus on a limit of 500 mRem acknowledges that while low doses of radiation carry some risk, the potential for significant adverse effects, particularly during early pregnancy when fetal development is most sensitive to radiation, is reduced when staying within this threshold.

In establishing a safe dose limit, the guidelines prioritize the health of both the mother and the fetus, indicating that exposures should be minimized whenever possible, especially during critical periods of fetal development.