Dr Mark Marais
May 2025
when particle and antiparticle meet, they annihilate
Particles, Antiparticles & Annihilation
Dr Mark Marais - 2025
let’s aim to
Dr Mark Marais - 2025
Dr Mark Marais - 2025
Dr Mark Marais - 2025
Dr Mark Marais - 2025
Dr Mark Marais - 2025
Dr Mark Marais - 2025
Bananas, the human body, and other natural sources of potassium-40 release positrons from β+ decay. These positrons react with electrons and release energy from the annihilation, but the reaction poses no health threat. Lightning also produces positrons, which react with matter to generate some gamma radiation. Cosmic rays contain positrons and some antiprotons. PET scans involve positrons. Solar flares may release antiprotons, which become trapped in the Van Allen radiation belt and can cause an aurora. Neutron stars and black holes produce positron-electron plasma.
Annihilation
If an electron encounters a positron, they annihilate with the transformation of their mass into the energies of two gamma rays.
Annihilate
destroy completely
Physics
convert (a subatomic particle) into radiant energy
Dr Mark Marais - 2025
In PET Imaging
Dr Mark Marais - 2025
Radioactive glucose
Dr Mark Marais - 2025
Gamma pairs
electron
positron
Gamma ray
Gamma ray
Dr Mark Marais - 2025
Write down the reaction
for…
Dr Mark Marais - 2025
Annihilation and Pair Production | vt.physics
Dr Mark Marais
May 2025
Dr Mark Marais - 2025