The Electromagnetic Spectrum. The Electromagnetic Spectrum. The EM spectrum is the ENTIRE range of EM waves in order of increasing frequency and decreasing wavelength.
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Visible LightRemembering the Order
This picture is a “scintigram”
It shows an asthmatic person’s lungs.
The patient was given a slightly radioactive gas to breath, and the picture was taken using a gamma camera to detect the radiation.
The colors show the air flow in the lungs.
Micro Worlds, Lawrence Berkeley National Laboratory. http://www.lbl.gov/MicroWorlds/ALSTool/EMSpec/EMSpec2.html
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Andy Darvill, Broadoak Community School, Radioactivity Uses