Radiodensity's the property of relative transparency to the passage of X-rays (and other radiation) through a material. Radiolucent indicates greater transparency or "transradiancy" to X-ray photons. Radiodense indicates greater opacity to X-ray photons. X-rays are part of the electromagnetic spectrum, with photon energies above visible (and ultraviolet) light photons. They're distinguished from gamma rays in that they're produced not by transitions within the atomic nucleus, but either by decel… (More on Radiodensity)