Help
Options
Didn't know it?
click below
click below
Knew it?
click below
click below
Don't Know
Remaining cards (0)
Know
retry
shuffle
restart
0:00
Embed Code - If you would like this activity on your web page, copy the script below and paste it into your web page.
Normal Size Small Size show me how
Normal Size Small Size show me how
carlton
week 2 ch. 12
| Question | Answer |
|---|---|
| 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
Popular Physics sets