PET Scanners Have to Be Close to the Source of Positrons

question 11

Multiple Choice

PET scanners have to be close to the source of positrons because:

• A) the positrons cannot travel very far.
• B) the nuclides are so unstable.
• C) of the examination radioactivity of the nuclides.
• D) of the short half-lives of the nuclides.

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