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the count rate from a y-source is measured to be 100 counts per minute. when 1.0cm of lead is placed between the source and the

the count rate from a y-source is measured to be 100 counts per minute. when 1.0cm of lead is placed between the source and the detector, the count rate is reduced to 100 counts per minute. what additional thickness of lead would have reduced the count rate to 50 counts per minute?

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