What is the product of a positron and electron combining then undergoing annihilation during the pet imaging process? a. two 511 kev photons are formed. b. x-rays are formed. c. a single gamma ray is formed. d. two high-speed beta particles are formed?

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29-01-2018
Chemistry

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What is the product of a positron and electron combining then undergoing annihilation during the pet imaging process? a. two 511 kev photons are formed. b. x-rays are formed. c. a single gamma ray is formed. d. two high-speed beta particles are formed?

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Dejanras Dejanras · Answer 1 · 2018-02-10T20:32:54+01:00

Dejanras Dejanras

10-02-2018

Answer is: a. two 511 kEv photons are formed.
When the positrons reach thermal energies, they start to interact with electrons by annihilation.
Positron-emission tomography (PET) is a nuclear medicine functional imaging technique that is used to observe metabolic processes in the body. The system detects pairs of gamma rays emitted indirectly by a positron-emitting radionuclide.

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