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15 Cards in this Set
- Front
- Back
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What is attenuation?
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It is a decrease or reduction in intensity.
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Answer charged particle or photon?
What form of radiation is concerned more with ion pairs created? |
charged particles
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Answer charged particle or photon?
What form of radiation is concerned more with range and energy dissipated per distance? |
charged particles
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Answer charged particle or photon?
What form of radiation is concerned more with attenuation and transmission? |
photon
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What four factors affect range?
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Energy
Mass Charge Density |
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What is the difference between LET and Stopping Power S?
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LET is concerned with the 'local' deposit of energy.
S is concerned with the total energy lost by the particle. |
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What three things, in general, can happen when photons pass through matter?
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Absorption
Scatter Transmission |
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Which two things make up attenuation?
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Absorption
Scatter |
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What does μ(linear) measure?
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The probability of the interaction of a photon passing through a unit area of a material 1-cm thick.
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Experimentally, it is much easier to use the ________ rather than μ(linear).
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HVL
Half-Value Layer |
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Define the HVL.
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The thickness in which a material attenuates half of the energy of the incident photon ray.
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Attenuation occurs because of the ____________, _____________, and _____________.
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photoelectric effect
Compton effect pair production |
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μ(linear) = ____________ + ___________ + ___________
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τ(photoelectric) + σ(Compton) + κ(pair production)
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What does W measure?
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The average energy expended per ion pair.
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What is specific ionization?
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A measurement that expresses the number of ion pairs per unit path (distance).
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