In a material medium,when a positron meets an | vedclass

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(B) When a positron $(e^+)$ encounters an electron $(e^-)$,they annihilate each other because they are particle-antiparticle pairs.This annihilation p

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$PET$

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(B) When a positron $(e^+)$ encounters an electron $(e^-)$,they annihilate each other because they are particle-antiparticle pairs.This annihilation process results in the conversion of their mass-energy into two gamma-ray photons,typically emitted in opposite directions to conserve momentum.This physical phenomenon is the fundamental principle behind Positron Emission Tomography,commonly abbreviated as $PET$ scan,which is used in medical diagnostics to image metabolic processes in the body.

In a material medium,when a positron meets an electron,both particles annihilate,leading to the emission of two gamma-ray photons. This process forms the basis of an important diagnostic procedure called:

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