CAMRT Radiography Practice Exam

What is the NCRP recommended occupational dose limit for an embryo or fetus per month?

1. 1 mSv

2. 0.5 mSv

3. 5.0 mSv

4. 10 mSv

The correct answer is: 0.5 mSv

The NCRP (National Council on Radiation Protection and Measurements) has established guidelines for occupational exposure to ensure the safety of both workers and, where applicable, their potential offspring. Specifically, for an embryo or fetus, the recommended occupational dose limit is set at 0.5 mSv per month. This limit is intended to protect the developing fetus from the potential harmful effects of radiation, particularly during the sensitive early stages of development. The rationale behind this limit takes into account the biological sensitivity of the fetus, as it is more vulnerable to radiation exposure than adults. The monthly dose limit ensures that the total exposure of the fetus remains within safe levels throughout a typical nine-month gestation period, ultimately not exceeding the total established limit of 5 mSv for the entire pregnancy. This careful regulation underscores the importance of monitoring radiation exposure for pregnant workers in medical and research settings. It reflects a proactive approach to radiation safety that seeks to minimize potential risks to both the worker and the developing fetus. In essence, the established monthly limit of 0.5 mSv provides a guideline that balances occupational exposure needs while prioritizing fetal health, illustrating the commitment to ensuring safety in radiological practices.