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

question 108

Multiple Choice

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.

• A)5.2 × 10^-2 hr
• B)4.6 × 10^-2 hr
• C)19 hr
• D)51 hr

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