Radiology: the eyes that look into our inner body
X-rays are a form of electromagnetic radiation, which is visible light.
The difference is that X-rays have a much shorter wavelength than visible
light and each X-ray particle, or photon, has much more energy than
a photon partical of visible light. Its short wavelength permits an
X-ray to penetrate the body and produce an image on film. Its high energy
causes electrons to be dislodged from atoms and molecules when X-rays
strike them. This results in ion formation and causes tissue damage
and, potentially, cancer. Therefore X-rays are known as ionizing radiation.