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Facts about Facts about photonsphotons
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PHOTONS
Smallest quantity of electromagnetic radiation
bundle of energy (AKA quantum)
travels at 186,400 miles per second
x-ray and visible light photons
energy disturbances no mass
have electric and magnetic fields that move in sine waves
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ELECTROMAGNETIC RADIATION James Clerk Maxwell discovered both
light and x-rays have electric and magnetic properties
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TERMINOLOGY OF A SINE WAVE
AMPLITUDE: 1/2 RANGE FROM CREST TO VALLEY
FREQUENCY: RISE AND FALL OF SINE WAVE (HZ).
ONE HZ IS EQUAL TO ONE CYCLE PER SECOND
WAVELENGTH: DISTANCE FROM ONE VALLEY TO ANOTHER OR ONE CREST TO ANOTHER
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FACTS ABOUT “c”, “f” AND LAMBDA C or V = velocity C increases as F(FREQUENCY)
increases As LAMBDA (WAVELENGTH)
increases, F decreases V = F x Lambda C = F X Lambda in electromagnetic
radiation
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Match the Units of measurement
HzMeterVolts
Energy Frequency Wavelength
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MISCELLENOUS FACTS
80 kVp= energies from 0-80 keV x-rays are emitted from electron cloud
gamma rays emitted from nucleus
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DEFINITIONS
Reflection Transmission Absorption Transparent Translucent Opaque
Significant in Radiology
Attenuation Radioopaque Radiolucent
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PLANCK’S QUANTUM THEORY Understanding of relationship between
energy and frequency X-ray photons travel at speed of light
and exist with velocity or do not exist at all
photon energy is proportional to photon frequency
Planck’s constant
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Application of Planck’s Constant
E(eV)=h(Planck’s constant or constant of proportionality*)x f(photon frequency)
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