(0.1mrad/hour) X (hour/60 min) X 10 min X 10 (QF)= ?

(0.1mrad/hour) X (hour/60 min) X 10 min X 10 (QF)= ?

• A. 0.33 mrem
• B. 0.017 mrem
• C. 0.67 mrem
• D. 0.25 mrem

Answer: (B)

The main idea is to convert dose rate times exposure time into a dose in mrem by applying the quality factor. First convert the time to hours: 10 minutes is 10/60 hours, which is 1/6 hour. Multiply the dose rate by the time to get the absorbed dose in mrad: 0.1 mrad/hour × 1/6 hour = 0.0167 mrad. To get mrem, multiply by the quality factor. For X-ray/gamma radiation, the quality factor is 1, so 0.0167 mrad × 1 ≈ 0.0167 mrem, which rounds to 0.017 mrem. Therefore, the best answer is about 0.017 mrem. If the quality factor were 10, you’d get about 0.167 mrem instead.

The main idea is to convert dose rate times exposure time into a dose in mrem by applying the quality factor. First convert the time to hours: 10 minutes is 10/60 hours, which is 1/6 hour. Multiply the dose rate by the time to get the absorbed dose in mrad: 0.1 mrad/hour × 1/6 hour = 0.0167 mrad. To get mrem, multiply by the quality factor. For X-ray/gamma radiation, the quality factor is 1, so 0.0167 mrad × 1 ≈ 0.0167 mrem, which rounds to 0.017 mrem. Therefore, the best answer is about 0.017 mrem. If the quality factor were 10, you’d get about 0.167 mrem instead.