Annihilation

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  • Created by: tahliaD
  • Created on: 13-10-15 13:35
What happens when a particle and an antiparticle meet?
Annihilation
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What happen during annihilation?
All the mass of the two particles in converted back into energy in the form of two gamma ray photons
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Why don't you get antipaticles in ordinary matter?
They can only exist for a fraction of a second before annihilation occurs
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Give the equation for the minimum energy of the photon produced
Emin=Eo
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Explain the equation
It is an particle-antiparticle pair which both have a rest energy of Eo so the two photons produced must share 2Eo between them or Eo each
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What does PET stand for?
positron- emission tomography
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Describe how a PET scanner works
a positron emitting isotope is placed into the bloodstream. The scanner then detects the gamma rays produced by the electron-positron annihilation.
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Why are these Gamma ray easy to distinguish between the others?
They are always produced in pairs travelling in opposite directions
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What is the radiation detected by?
The scintillator
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How does a scintillator form an image?
It contains scintillation crystals which detect the gamma rays and produce flashes of light. This light is detected and forms an image
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Other cards in this set

Card 2

Front

What happen during annihilation?

Back

All the mass of the two particles in converted back into energy in the form of two gamma ray photons

Card 3

Front

Why don't you get antipaticles in ordinary matter?

Back

Preview of the front of card 3

Card 4

Front

Give the equation for the minimum energy of the photon produced

Back

Preview of the front of card 4

Card 5

Front

Explain the equation

Back

Preview of the front of card 5
View more cards

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