Fluorine-18 is an isotope used in Positron Emission Tomography (PET)to scan the brain.If a researcher has 1.50 μg of ¹⁸F,how long before it decays to 1.0 ng? The half-life of ¹⁸F is 109.8 minutes.

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Quizplus · Accepted Answer

The decay of a radioactive isotope is calculated using the formula N(t) = N0 * (1/2)^(t/T), where N0 is the initial quantity, N(t) is the remaining quantity, t is the time elapsed, and T is the half-life. Converting 1.50 μg to ng gives 1,500,000 ng. Solving for t when N(t) = 1.0 ng, we find t ≈ 19 hours.

Fluorine-18 Is an Isotope Used in Positron Emission Tomography (PET)to