A Patient Is Injected with a 5

question 88

Multiple Choice

A patient is injected with a 5.0 M solution of gallium citrate containing radioactive gallium-68 for a PET study. The half-life of gallium-68 is 9.4 hr. How long does it take for the activity of this isotope to drop to 1% of its initial value?

• A)18 hr
• B)25 hr
• C)32 hr
• D)41 hr
• E)62 hr

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Definitions:

Nomenclature

A system of names or terms, or the rules for forming these terms in a particular field of arts or sciences.

Zea Mays

A plant species known as maize or corn, widely cultivated as a food crop for humans, livestock, and as a biofuel source.

Biological Themes

Fundamental concepts that recur throughout the study of life, helping to organize and explain biological processes.

Neuron

A nerve cell; a conducting cell of the nervous system that typically consists of a cell body, dendrites, and an axon.