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Consider a sample of 12 grams of 18F with an activity of 640 kBq. The half-life...

Consider a sample of 12 grams of 18F with an activity of 640 kBq. The half-life of fluorine-18 is about 20 minutes. (g) [2 points] What is the mass of the sample (in grams) after 1 hour? (h) [2 points] What is the activity of the sample (in kBq) after 1 hour? (i) [3 points] How many minutes does it take for the sample to be 90% less radioactive? In other words, how many minutes does it take for the activity to go from 640 kBq to only 64 kBq

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