RT PROCH ENDTERM Flashcards
X-rays that exit the patient interacts with?
Input phosphor
Input phosphor is made up of what
Cesium iodide
Metal layer composed of cesium and antimony
Photo cathode
A series of lenses inside the II tube to maintain proper focus of photoelections emitted from the photocathode
Electrostatic focusing lens
Located at the neck of II tube
Donut shaped - made up of tungsten
Accelerating anode
Site where accelerated electrons interact and produces light ( e-visible image )
Made up of zinc cadmium
Output phosphor
Magnification mode results in
1.) better spatial resolution 2) better contrast resolution 3.) higher patient radiation dose
Provide considerably greater flexibility in all fluoroscopic examination
Multified image intensification
Non ionizing Radiation
Radio frequency , infrared, ultraviolet light, visible light
Ionizing radiation
X-ray, gamma ray, alpha radiation
Radiation that travels in a space possessing either mass or charge or both
Particulate radiation
Possess high kinetic energy
Alpha, beta, neutrons or nuclear fragments
Particulate radiation
Radiation that travels in wave form
accompanied by electrical and magnetic field
electromagnetic Radiation
Travels at the speed Of light
Potential energy
X-ray gamma rays
Electromagnetic Radiation
Divided in larger and shorter wave length
Electromagnetic spectrum
Longer wavelength
Radio frequency, infrared light, visible light, ultra violet light
Higher frequency - higher energy
Shorter wavelength
Shorter wave length
Xray gamma ray
Occupies the smallest fragment of the EMS
Visible light
Who discovered gamma ray?
Paul Villard
Source of ionizing Radiation
Natural or background - manmade or artificial
How much % is the external and internal
E- 60
I-22
Terrestrial
Ur/th/ Rn (strongest)
Terrestrial
Ur/th/ Rn (strongest)
Ingested
K-40, c-14
Manmade
18%
Medical-16%
Nuclear powerplant
Industrial sources
Consumer items
Ionization of air by X-ray or gamma ray by dividing the number of ions formed in one side with the. The mass of air (ion pair is produced)
Exposure (x)
Energy of X-ray required to produced ion pair in gas
> 34 ev
Energy transferred by ionizing radiation to the interacting medium per mass
Patient dose
Absorbed close
What is rad
Absorbed dose
New name of rad
Gray
Radiation received by rad techs
Equivalent dose (h)
Radiation received by rad techs
Equivalent dose (h)
What is REM
Radiation equivalent by men
New name of REM
Sievert
Unit of exposure
Old-roentgen new - couloumb/kg
Excitation
Heat, infrared, vibration
Removal or addition of election with atom
Ionization
Electron bounces off during ionization
Ion pair
excitation → heat
Classical scattering
Diff names of classical scattering
Rayleigh, coherent, Thomson
< 10 kev
Classical scattering
Ionization ( outer shell )- scatter radiation
Compton interaction/scattering
Ionization ( inner shell) - characteristic xray
Photoelectric effect
Pair production
Nuclear field → position negatron
Pet → positron emission tomography
Photo disintegration
- Nuclear field → nuclear fragments → nuclear power plant
↑ 1.022 Mev
Pair production
↑ = 7 to 10 mev
Photo disintegration
Who observed photo electron and what yr
Heinrich hertz 1887
When negatron and positron energies combine _ counter part of pair production
Annihilation process
