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SAFETY

ARRT content specs

QuestionAnswer
step 1 of x-ray production filament heating
filament heating electric current heating the filament and releasing free electrons through thermionic emission
step 2 of x-ray production electron acceleration
what accelerates the electrons kVp across the tube creates an electric field, pulling electrons to the anode
step 3 of x-ray production target interaction
target interaction electrons striking the anode and converting energy into x-rays and heat
what is the anode made of? tungsten rhenium
step 4 of x-ray production x-ray emission
thermionic emission the process of heat causes the filament to release electrons (boiling off electrons)
key words related to mAs - quantity - filament current - electron flow
what decelerates the electrons? interactions with the anode atoms slows electrons, converting kinetic energy into x-rays or heat
___% heat and ___% x-rays at the anode 99% heat and 1% x-rays
x-ray properties - penetrating - invisible - electromagnetic - travel in straight lines - ionizes matter
72-SID x-ray beam divergence 1 degree per inch
40-SID x-ray beam divergence 2 degree per inch
how fast do x-rays travel? speed of light
do x-ray photons have mass? no, they are massless
do x-ray photons have a charge? no, they are neutral
wavelength - distance between wave peaks - measured in nanometers (nm)
frequency - number of waves per second - measured in hertz
relationship between wavelength and frequency inversely proportional
main controlling factor for beam quantity mAs
photoelectric effect - inner shell interaction - complete absorption - patient dose - produces white area on x-rays
compton effect - outer shell interaction - energy loss - produces fog/scatter radiation - occupational dose
radiolysis ionization of the water molcule
attentuation reduction in x-ray beam intensity due to absorption and scattering in matter
what is the amount of attentuation dependant on? - atomic number - tissue density - thickness - x-ray energy (kVp)
hardware is an example of ___ attenuation high
air is an example of ___ attneuation low
least to most attenuating factors air -> fat -> water/tissue -> muscle -> bone/metal
Created by: mkopp1
 

 



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