science
How does nuclear medicine use short-lived isotopes for PET scans?
š” The Answer
- Positron Emission Tomography (PET) uses positron-emitting isotopes like F-18.
- A positron annihilates with an electron, producing two gamma rays in opposite directions.
- Detectors record these gamma rays to localize the source and create 3D images.
- Short half-lives require on-site production with cyclotrons.
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