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RAD 121 Vocabulary

Unit 2 words/concepts

QuestionAnswer
Explain coherent scatter also called classical, Thomson, Rayleigh or UNMODIFIED low energy (10-20keV) xrays interact with tissues and are absorbed, exciting the atom which then releases the energy in a different direction NO IONIZATION
Explain Compton scatter also called UNMODIFIED scatter occurs throughout the diagnostic range (20-125keV) incident XR interacts with outer orbital electron, ejecting it (recoil electron). The incident photon loses up to 1/3 energy and deflects in a different direction
What 3 things occur with Compton scatter *causes IONIZATION *Recoil electron goes on to have its own interactions *Incident photon is deflected in a new direction
What is fog?
What is noise?
Which interactions are dominant with higher kVp? Compton interactions
Which interaction gives tech/MD their occupational dose? Unmodified Compton
Explain photoelectric event. XR = > orbital shell binding energy occur throughout diagnostic range/involve INNER shell orbital electrons incident photon ejects inner orbit electron, incident photon is completely absorbed, causes a cascade, emitting secondary radiation
backscatter
attenuation
absorption
transmission
secondary radiation
effect of photoelectric event on patient dose
Explain pair production
Explain photodisintegration
positron
annihilation event
Emission spectrum
portions of emission spectrum
discrete emission spectrum
continuous emissions spectrum
Beam quantity
Beam quantity and mAs
Beam quantity and kVp
Beam quantity and distance
Beam Quality
Beam quality and kVp
Beam quality and Filtration
Beam Quality and HVL
Differential absorption
Created by: Larobbins