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Calculation of Intervals

The half-life...

Question

The half-life of the source is $30$ min. What correct readings would you expect to obtain, with no absorber present, one hour after original readings were taken?

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Solution

The half-life of the source is 30 minutes.
Initial count rate is 600 counts/min
In 30 minutes, count rate would reduce to 300 counts/min. In the next 30 minutes, it would be 150 counts/min.

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