If the X-rasy coming from a coolidge tube are examined for wavelengths present, and the intensity of different wavelengths are measurea and plotted, we can observe that there is a minimum wavelength below which no X-ray is emitted.
The wavelength below which no X-rays are emitted is called the cut-off wavelength or the threshold wavelength.
From the plot it can also be observed that at certain sharply defined wavelengths, the intensity of X-rays is very large. These X-rays are called characteristic X-rays.
At other wavelengths the intensity varies gradually and these X-rays are called continuous X-rays.
K X-Rays
X-rays emitted due to electronic transition from a higher energy state to a vacancy created in the K shell are called K X-rays.
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An X-ray machine is a device used by radiographers to acquire an x-ray image for diagnostic. For more information about parts and functional concepts of x-ray machines, please visit this link,
http://x-ray-tube.blogspot.com/
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