Explain the activity of an isolated sample of gas

Reference no: EM13245238

The activity of an isolated sample of gas obtained from a basement containing radon-222 was found to be 8 pCi/L. This isotope has a half-life of 3.8 days. If no additional radon-222 entered the sample, how long would it take for the activity to decline to 1 pCi/L?

Reference no: EM13245238

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