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Positron emitting radioisotopes (such as fluorine 18) are placed within the body to attach themselves to concentrations of the material that you wish to locate. Electrons are them emitted from a source with collide with the emitted positrons to create 2 photons. The energy-filled photons are reflected in almost perfectly oppposite directions onto a circular detector placed around the radioisotope. This creates a line of general location of the radioisotopes, and therefore the material that you are searching for (ie tumors)

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15y ago

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