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At the beginning of this clip we see Dr. Kevin Boyce as he explains
what a spectrum is.
We see a plot of a "Typical X-ray Spectrum", with "Energy (keV)" on
the horizontal axis, and "Relative Intensity" on the vertical axis.
The horizontal axis has values ranging from 1 to 8. The spectrum
shows peaks that are labeled with symbols for the chemical elements
(e.g. Mg, Al, Si, Ca, Ti, Fe).
We then see a graphic of the electromagnetic spectrum, spanning
from radio to infrared to optical to X-rays to gamma rays.
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KEVIN: The XRS is primarily a spectrometer. And that is to say, it looks at the spectrum of photons that comes from a given source. The spectrum will tell you how hot it is, what it's made of, how fast it's moving. So, if you put light through a prism, you get a spectrum of colors - same thing is true of X-rays. There's higher energy - shorter wavelength and lower energy - longer wavelength.
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