An invisible form of energy that is given off by atoms.
The highest energy electromagnetic radiation. It has a very short wavelength.
One of the rays emitted by radioactive substances. Gamma rays are highly penetrat-ing and can traverse several centimeters of lead.
The most penetrating of all electromagnetic radiation, gamma rays are very high-energy electromagnetic rays that are sometimes used in cancer radiotherapy.
A very high-energy photon, emitted from the nucleus of an atom as it undergoes a change in energy levels.
The highest energy, shortest wavelength form of electromagnetic radiation.