Radon decays through a chain of four very short-lived radionuclides (half- lives of 20 minutes and less) before reaching a relatively stable isotope of lead. Ap- proximately what activity will the vial have two or three hours after filling, and about two weeks after filling?

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Radon decays through a chain of four very short-lived radionuclides (half- lives of 20 minutes and less) before reaching a relatively stable isotope of lead. Ap- proximately what activity will the vial have two or three hours after filling, and about two weeks after filling?

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