According to NCRP Report #116, embryo or fetus equivalent dose limit per month?

According to NCRP Report #116, embryo or fetus equivalent dose limit per month?

• A. 0.5 mSv
• B. 0.1 mSv
• C. 5 mSv
• D. 0.05 mSv

Answer: (A)

The question tests the monthly dose limit for the embryo or fetus in occupational radiation protection. NCRP Report #116 specifies that the embryo/fetus should not receive more than 0.5 mSv of equivalent dose in any one month. This monthly cap helps keep the total fetal dose during a typical nine‑month pregnancy under the recommended pregnancy limit (about 5 mSv in total). If you multiply 0.5 mSv by roughly nine months, you get about 4.5 mSv, which stays below that overall limit and provides a safety margin. The other values don’t fit: 0.1 mSv or 0.05 mSv would be stricter than necessary for monthly exposure, and 5 mSv per month would quickly exceed the pregnancy limit.

The question tests the monthly dose limit for the embryo or fetus in occupational radiation protection. NCRP Report #116 specifies that the embryo/fetus should not receive more than 0.5 mSv of equivalent dose in any one month. This monthly cap helps keep the total fetal dose during a typical nine‑month pregnancy under the recommended pregnancy limit (about 5 mSv in total). If you multiply 0.5 mSv by roughly nine months, you get about 4.5 mSv, which stays below that overall limit and provides a safety margin. The other values don’t fit: 0.1 mSv or 0.05 mSv would be stricter than necessary for monthly exposure, and 5 mSv per month would quickly exceed the pregnancy limit.