Which is the total exposure when the dose rate is 60 mrad per hour and the exposure time is 20 minutes?

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Multiple Choice

Which is the total exposure when the dose rate is 60 mrad per hour and the exposure time is 20 minutes?

Explanation:
Total exposure comes from multiplying the dose rate by the exposure time, making sure the time units match. A dose rate of 60 mrad per hour and an exposure time of 20 minutes convert to 20/60 hours (which is 1/3 hour). So the exposure is 60 mrad/hour × 1/3 hour = 20 mrad. Another way to see it is that 60 mrad per hour equals 1 mrad per minute, and over 20 minutes you accumulate 20 mrad. The result is 20 mrad.

Total exposure comes from multiplying the dose rate by the exposure time, making sure the time units match. A dose rate of 60 mrad per hour and an exposure time of 20 minutes convert to 20/60 hours (which is 1/3 hour). So the exposure is 60 mrad/hour × 1/3 hour = 20 mrad. Another way to see it is that 60 mrad per hour equals 1 mrad per minute, and over 20 minutes you accumulate 20 mrad. The result is 20 mrad.

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