What is the dose limit for a classified worker according to regulations?

• A. 6mSv
• B. 20mSv
• C. 1mSv
• D. 50mSv

Answer: (B)

The idea being tested is how regulations protect workers who may receive higher radiation doses by setting specific occupational limits. For a classified worker, the allowable effective dose is 20 mSv in a year, but this is to be averaged over any five consecutive years, meaning the five-year total should not exceed 100 mSv. This structure ensures short-term exposure stays low while accounting for longer-term risk.

So, 20 mSv per year (with the five-year average cap) is the standard limit for a classified worker. The other numbers don’t fit this specific occupational category: 1 mSv is a typical public annual limit, not for classified workers; 6 mSv can be used as a threshold for determining classification in some regulations, not the annual limit itself; and 50 mSv is a different upper bound sometimes cited in other contexts, but not the recognized annual limit for a classified worker.