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week 2 ch. 12

attenuation reduction in the number of photons in the beam as it passes through matter
xray photons can interact with what 3 things whole atom-orbital electron-nucleus
a whole atom is what type of energy low
orbital is what type of energy medium
nucleus is what type of energy high
most diagnostic energy is orbital
in K shell electons and binding energy the higher the atomic number the more energy required to remove k shell electron
the further the electron is from the nucleus the higher the total energy
with each successive shell, electron energies increase as binding energy decreases
5 interactions photoelectric absorption-coherent scattering-compton scattering-pair production- photodisintegration
2 diagnostic photoeletric & compton
with each diagnostic interactions xray photons either what pass through -scatter or be absorbed
body atoms produce low energy secondary radiation
what two elements used in the body produce a higher energy secondary radiation barium 56 & iodine 53
a PE is more likely to occur with electrons more tightly bound in its orbit
Pe is more likely to occur when photon energy and binding energy are close together
incident photon energy is higher than binding of inner shell electron
below 10 KeV is coherent scatter
1.02 MeV is pair production
10 MeV is photodisintegration
two other names for coherent scatter classical and unmodified
unwanted density is from scatter is ratiation fog
grids clean up scatter
in pair production a positron and negative electron combine and disappear to produce 2 photons moving in opposite directions
what is that process called annihilation
in photodisintegration the nucleus responds by emitting a nuclear fragment
as kvp increases the total # of photons which are transmitted without interaction increases
% of PE decreases with ________ kvp increasing
% fo compton increases with increasing __ kvp
compton scatter is most predominant in the human body
Pe cominates in 40-70kvp range in barium and iodine are introduced
what is a recoiled electron a dislodge or ejected electron
what is a compton scatter photon a photon that exits the atom in different direction
Created by: Pruettsgirl
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