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Positron (+) radiation - annihilation

pn + + +

18F

= 511 keV

= 511 keV

1.

a proton inside the 18F nucleus turns to a neutron while a positron (+) and a neutrino are emitted

2.

positron gradually loses kinetic energy during interaction with surrounding atoms

3.

positron combines with an surrounding electron

4.

positron and electron are being converted to the gamma photons which are emitted at 180° to each other, each with energy 511 keV - annihilation

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