Radiodensity is 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.Novelline, Robert. Squire's Fundamentals of Radiology. Harvard University Press. 5th edition. 1997. ISBN 0674833392. 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 are di… (More on Radiodensity)