A worker is monitored when exposures exceed what annual value?

• A. Exposures measured to exceed 100 mrem/yr.
• B. Exposures exceed 1 rem/yr.
• C. Exposures exceed 10 mrem/yr.
• D. Exposures exceed 500 mrem/yr.

Answer: (A)

Monitoring thresholds are set to catch potential increases in exposure early and keep doses within safe, regulatory bounds. In many radiation safety programs, if there’s any chance an worker could accumulate about one hundred millirem in a year, that triggers the use of personal dosimetry and closer tracking. This conservative level helps ensure that total annual exposures stay well below larger limits and that any upward trend is noticed promptly so controls can be adjusted.

So, when exposures are expected to exceed around one hundred millirem per year, monitoring starts. The other options represent values that are either much higher or much lower than the typical monitoring trigger: they either would not flag monitoring early enough or would imply a different, less conservative stance on dose tracking.