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===Examples===
[[Positron [[EmitEmission Tomorgraph|Positron emission]] tomography]] ([[Positron Emission Tomography|PET]]) scans detect [[Gamma-ray|gamma rays]] from [[electron]]-[[positron]] [[annihilation]].
[[Particle Accelerator|Particle accelerators]] study [[annihilation]] events to understand [[Fundamental Particle|fundamental particles]].