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1. A Po-210 sample was prepared and counted for 30 minutes each in a detector with a 50% efficiency and 100 counts of background in

1. A Po-210 sample was prepared and counted for 30 minutes each in a detector with a 50% efficiency and 100 counts of background in 10 minutes. The count-rate of the sample was found to be 25,163 counts in 30 minutes. What is the activity and standard deviation of the sample? What is the standard deviation of the count-rate?

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1. A Po-210 sample was prepared and counted for 30 minutes each in a detector with a 50% efficiency and 100 counts of background in 10 minutes. The count-rate of the sample was found to be 25,163 counts in 30 minutes. What is the activity and standard deviation of the sample? What is the standard deviation of the count-rate

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