In Positron Emission Tomography (PET),a Positron Emitted from an Unstable

question 108

Multiple Choice

In positron emission tomography (PET) ,a positron emitted from an unstable isotope travels a short distance before it is annihilated by

• A) an electron,creating a proton that is detected by the instrument.
• B) a neutron,creating two gamma rays that travel in opposite directions.
• C) an electron,creating two gamma rays that travel in opposite directions.
• D) an alpha particle,creating two protons that travel in opposite directions.
• E) gamma ray,creating an electron that is detected by the instrument.

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