24-hour notification is required if an individual has received overexposure within 24 hours: Total effective dose exceeding what?

• A. 10 rems
• B. 15 rems
• C. 25 rems
• D. 5 rems

Answer: (D)

The main idea is that there’s a regulatory requirement to notify within 24 hours when a whole-body dose in a single day exceeds a set threshold. That threshold is 5 rem (50 mSv). This level is used because it matches the annual occupational dose limit, so a 24-hour exposure of this magnitude signals a potential overexposure for the year and warrants prompt reporting and investigation to protect safety and ensure proper corrective actions.

The other numbers aren’t the defined 24-hour notification threshold, though they would also trigger concern if reached. The standard prompt-notification trigger is 5 rem.