Facts about photons.

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Presentation transcript:

Facts about photons

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

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

Frequency and wavelength Their relationship Shorter wavelength Higher Frequency Longer Wavelength Less frequency At a given velocity, wavelength and frequency are inversely proportional.

The spectrum

Match the Units of measurement Hz Meter Volts Energy Frequency Wavelength

Significant in Radiology DEFINITIONS Reflection Transmission Absorption Transparent Translucent Opaque Significant in Radiology Attenuation Radioopaque Radiolucent

Chapter 1, Fauber, page 8 Based on your understanding thus far of x-rays- name some of their characteristics

MISCELLENOUS FACTS 80 kVp= energies from 0-80 keV x-rays are emitted from electron cloud gamma rays emitted from nucleus