In a positron emission tomography (PET) scan, a radionuclide that decays by positron emission is…

In a positron emission
tomography (PET) scan, a radionuclide that decays by positron emission is
injected into a patient. The PET scan works by detecting gamma rays emitted in
two directions when the emitted positron combines with an electron and both are
annihilated.

(a) Oxygen-15 and [email protected] water
are often used with PET scans to study oxygen metabolism. For example, PET
scans can be used to determine the viability of heart tissue to determine the
effectiveness of heart surgery. Oxygen-15, which has a half-life of 2.03
minutes, decays according to the following reactions:

»

In a positron emission
tomography (PET) scan, a radionuclide that decays by positron emission is
injected into a patient. The PET scan works by detecting gamma rays emitted in
two directions when the emitted positron combines with an electron and both are
annihilated.

(a) Oxygen-15 and [email protected] water
are often used with PET scans to study oxygen metabolism. For example, PET
scans can be used to determine the viability of heart tissue to determine the
effectiveness of heart surgery. Oxygen-15, which has a half-life of 2.03
minutes, decays according to the following reactions:

Nitrogen-15 is a stable,
naturally occurring isotope. Show that net charge is conserved during these
reactions.

(b) Carfentanil labeled
with carbon-11 has been used to study opiate receptors in monkey and human
brains. Carbon-11, which has a half-life of 20.4 minutes, decays according to
the following reactions:

 is a
stable, naturally occurring isotope. Show that net charge is con-served during
these reactions.

 

»

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