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NEED ASAP If a sample of F18 initially has an activity of 489MBq, what will the activity be after 360 minutes? The half-life of F18

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If a sample of F18 initially has an activity of 489MBq, what will the activity be after 360 minutes? The half-life of F18 is 110 Minutes. Calculate the atomic number density of natural uranium in UO2 with UO2= 10.5g/cm3

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