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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Definitions:

Columbian Exchange

The transatlantic flow of goods and people that began with Columbus’s voyages in 1492.

Transatlantic Flow

The movement of people, goods, information, and culture across the Atlantic Ocean, significantly shaping societies on both sides of the ocean.

Christopher Columbus

An Italian explorer who completed four voyages across the Atlantic Ocean, opening the way for European exploration and colonization of the Americas.

Protestant Reformation

A major 16th-century movement aimed at reforming the beliefs and practices of the Roman Catholic Church, leading to the creation of Protestantism.