A family member stood in a hallway for 20 minutes. The exposure rate at the site was 0.5 mrem per hour. How much radiation did the family member receive?

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Multiple Choice

A family member stood in a hallway for 20 minutes. The exposure rate at the site was 0.5 mrem per hour. How much radiation did the family member receive?

Explanation:
Multiplying the exposure rate by the time of exposure gives the dose. The rate is 0.5 mrem per hour and 20 minutes is one third of an hour (20 ÷ 60 = 0.333…). So the dose is 0.5 × 0.333 ≈ 0.1667 mrem, which rounds to 0.17 mrem. Therefore, about 0.17 mrem was received. The other values would require longer exposure or a higher rate.

Multiplying the exposure rate by the time of exposure gives the dose. The rate is 0.5 mrem per hour and 20 minutes is one third of an hour (20 ÷ 60 = 0.333…). So the dose is 0.5 × 0.333 ≈ 0.1667 mrem, which rounds to 0.17 mrem. Therefore, about 0.17 mrem was received. The other values would require longer exposure or a higher rate.

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