Immediate notification is required when the total effective dose equivalent reaches or exceeds how many rems?

• A. 10 rems
• B. 25 rems
• C. 50 rems
• D. 75 rems

Answer: (B)

In radiation safety, there is a specific dose level that triggers immediate reporting because it indicates a significant exposure requiring rapid investigation and protective actions. The threshold you must watch for is 25 rems (which is 250 mSv). When the total effective dose equivalent to any individual reaches or exceeds this amount, immediate notification is required so the dose can be reviewed, controls adjusted, and potential overexposure issues addressed right away.

Lower values would generate too many alerts for routine operations, and higher values are still serious, but the standard immediate-notification trigger used in many safety programs is 25 rems.