What is the occupational exposure limit for the fetus of radiation workers per year?

The occupational exposure limit for the fetus of radiation workers is set at 0.5 rem (or 5 mSv) per year. This limit is established to protect the developing fetus from potential harmful effects of radiation exposure during pregnancy.

The rationale behind this limit stems from the understanding that the fetus is especially sensitive to radiation due to its rapid growth and development. High levels of radiation exposure, especially during critical periods of development, can lead to an increased risk of radiation-induced malformations, developmental delays, or other health issues.

Maintaining the exposure limit at 0.5 rem helps ensure that the risks are minimized for both the pregnant worker and the fetus, in accordance with guidelines set forth by organizations such as the National Council on Radiation Protection and Measurements (NCRP) and the American National Standards Institute (ANSI).

In contrast, higher limits such as 5 rem, 50 rem, and 15 rem are not appropriate for fetal exposure, as they would significantly increase the risk of adverse effects to the fetus, which is why they are not accepted as limits for occupational exposure in this context.