Science / Weather / X-Rays: The portion of the electromagnetic spectrum that has a very short wave length. It has a wave length longer than gamma rays, yet shorter than visible light. X-rays can penetrate various thicknesses of all solids, and when absorbed by a gas, can result in ionization.

Bitewing X-Rays

Health / Dentistry / Bitewing X-Rays: X-rays taken of the crowns of teeth to check for decay. MORE

Tungsten (W)

Science / Periodic Table of Elements / Tungsten (W): Atomic number: 74, Atomic mass: 183.85 g.mol -1, Electronegativity accoridin to Pauling: 1.7, Density: 19.3 g.cm-3 at 20°C, Melting point: 3410 °C, Boiling point: 5660 °C, Vanderwaals radius: 0.137 MORE

Beryllium (Be)

Science / Periodic Table of Elements / Beryllium (Be): Atomic number: 4, Atomic mass: 9.01218 g.mol -1, Electronegativity: 1.5, Density: 1.86 g.cm-3, Melting point: 1280 °C, Boiling point: 2970 °C, Vanderwaals radius: unknown, Ionic radius: unknown, Iso MORE


Entertainment / Photography / Radiography: Technique of using x-rays, gamma rays and charged particles to form shadow images on photographic materials. Used in medical and industrial research because of its ability to penetrate opaque objects. MORE

CT Scanning (Computerized Tomography)

Science / Psychiatry / CT Scanning (Computerized Tomography): (to-mog-raf-ee) A technique using x-rays or ultrasound waves to produce an image of interior parts of the body. For example, within the skull it can be used to view parts of the brain as an aid to dia MORE


Science / Weather / Ultraviolet: Electromagnetic radiation that has a wavelength shorter than visible light and longer than x-rays. Although it accounts for only 4 to 5 percent of the total energy of insolation, it is responsible for MORE