Investigation Action Levels are used to trigger what?

• A. Exceeds limit set by RSO to trigger an investigation
• B. Exceeds dose limits set by CFR 20
• C. Lifetime exposure report
• D. Quarterly report

Answer: (A)

Investigation Action Levels are thresholds that trigger an inquiry when radiation monitoring shows results above a predefined level. These levels are set by the Radiation Safety Officer (RSO) to catch potential issues early and prompt a root-cause analysis, not to enforce regulatory dose limits. When an action level is exceeded, the goal is to investigate possible causes—such as instrument malfunction, procedural noncompliance, or unusual work practices—and implement corrective actions to prevent future problems.

This is distinct from regulatory limits found in CFR 20, which set legally enforceable dose limits. It’s also not about generating lifetime exposure reports or routine quarterly reporting; the action levels specifically serve to initiate an investigation and corrective measures in response to abnormal monitoring results.