Term
| what are 2 major types of x-rays produced |
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Definition
-General or Braking radiation accounts for 70% of the energy
-characteristic radiation about 30%
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Term
| what happens during general/braking radiation? |
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Definition
electrons speeding fast hit tungsten target and brake
70% of x-ray energy produced at anode
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Term
| what part of the atom does the electron hit when talking about general radiation? |
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Definition
| -either hits nucleus or comes extremely close to nucleus. |
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Term
| what happens to all of the kinetic energy when an electron hits a nucleus in general radiation? |
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Definition
| kinetic energy is converted to high-energy x-ray photons |
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Term
| what happens when the general radiation nearly misses the nucleus of the atom? |
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Definition
| -electron is attracted and slows down the x-ray photon so lower energy is the result. |
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Term
| if general radiation has lower radiation what happens to nucleus |
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Definition
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Term
| if general radiation results in high energy what happens at nucleus? |
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Definition
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Term
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Definition
| -high speed electron dislodges and inner shell electron from tungsten atom and ionization occurs, the rest of the electrons of that atom rearrange to fill vacancy. |
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Term
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Definition
-happens in tubehead it is what comes through PID
-70% general and 30% characteristic
-it is the penetrating x-ray beam that is produced at tahe target of anode. |
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Term
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Definition
the x-radiation that is created when the primary beam interacts with matter (tissues)
it is less penetrating than primary radiation |
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Term
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Definition
- a form of secondary radiation
-it hits tissue and is deflected in all directions
-can be harmful to both patient and radiographer |
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Term
| what are the possible interactions of x-radiation |
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Definition
-x-ray can pass through patient with no interaction
-x-ray can be completely absorbed by patient.
-x-ray can scatter |
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Term
| if there is no changes to tissue what is the interaction? |
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Definition
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Term
| what is the photoelectric effect? |
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Definition
-when ionization occurs and interacts with tissues.
-an x-ray photon collides with a tightly bound inner shell electron and gives up all energy to eject electron from orbit
-accounts for 30% of interaction with matter in dental x-rays |
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Term
| what are some types of scatter? |
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Definition
-compton (on the q shell)
-coherent (no ionization)
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Term
| which type of scatter includes ionization where the x-ray collides with the outer shell (q shell) and gives up energy causing an x-ray photon to loose energy and go in another direction? |
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Definition
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Term
| what type of scatter is associated with secondary radiation and accounts for 62% of the scatter that occurs in diagnostic radiography? |
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Definition
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Term
| what happens after the x-ray photon goes in another direction when talking about compten scatter? |
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Definition
| it interacts with other atoms until it looses all of its energy. |
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Term
| what type of scatter happens when x-ray interacts with matter and no ionization occurs? |
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Definition
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Term
| what type of scatter accounts for 8% of matter in dental x-ray beam? |
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Definition
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