NANTeL Radiation Worker Training Practice Test

Which distance is used in the dose-rate criteria for Radiation Area definitions?

30 centimeters 60 centimeters 1 meter 3 meters

Correct Answer:

30 centimeters

Explanation:

Distance is fixed at 30 centimeters when applying the dose-rate criteria for Radiation Area definitions. Measuring at 30 cm provides a consistent, conservative boundary to decide if an area could expose workers above the allowed rate. Because dose rate falls off with distance, using this close-in, standardized distance makes it easier to classify areas reliably across different sources and setups. The other distances aren’t used for this specific criterion, so they don’t fit the definition.

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