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Definition of Gamma rays

Babylon English

electromagnetic radiation from the nuclei of atoms (similar to X rays but with a shorter wave length)
Gamma rays Definition from Language, Idioms & Slang Dictionaries & Glossaries
hEnglish - advanced version

gamma rays
\gam"ma rays\ (physics) very penetrating rays not appreciably deflected by a magnetic or electric field, emitted by radioactive substances. the prevailing view is that they are non-periodic ether pulses differing from r?ntgen rays only in being more penetrating.

Gamma rays Definition from Science & Technology Dictionaries & Glossaries
General Chemistry Glossary
( -rays) A very high energy form of electromagnetic radiation , typically with wavelengths of less than 3 pm. Gamma rays are produced by certain nuclear decay processes, and are used to sterilize food.
Solar Energy
High energy radiation (energies in excess of 100 keV) observed during large, extremely energetic solar flares .
ASTRONOMY UNBOUND
A high energy form of electromagnetic radiation. The wavelength of gamma rays is typically less than 10-12 metres. They differ from X-rays in that they originate in the nucleus of atoms. A gamma ray is a photon, i.e. a discrete packet of many waves. Like all electromagnetic radiation it travels at the speed of light and when thought of as a particle is a boson with intrinsic angular momentum (spin) 1. It carries a quantum of energy (E=hf, where h is Planck's constant and f the frequency of the wave) and linear momentum and hence exerts radiation pressure. There are no gamma rays in the nucleus, any more than there are any photons in an atom, they are created at the instant of emission.

Some very hot (> 106 K) neutron stars emit radiant energy, not in the visible region, but in the form of gamma rays (possibly bremsstrahlung ). One such example is Pulsar 1055-52.
Gamma rays Definition from Computer & Internet Dictionaries & Glossaries
Integrated Circuit Terminology
electromagnetic radiation with a wavelength of <10 picometers.
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Gamma rays Definition from Encyclopedia Dictionaries & Glossaries
Wikipedia English - The Free Encyclopedia
Gamma radiation, also known as gamma rays, and denoted by the Greek letter γ, refers to electromagnetic radiation of extremely high frequency and therefore high energy per photon. Gamma rays are ionizing radiation, and are thus biologically hazardous. They are classically produced by the decay from high energy states of atomic nuclei (gamma decay), but are also created by other processes. Paul Villard, a French chemist and physicist, discovered gamma radiation in 1900, while studying radiation emitted from radium. Villard's radiation was named "gamma rays" by Ernest Rutherford in 1903.

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Gamma rays Definition from Medicine Dictionaries & Glossaries
CDC Radiological Terms
high-energy electromagnetic radiation emitted by certain radionuclides when their nuclei transition from a higher to a lower energy state. These rays have high energy and a short wave length. All gamma rays emitted from a given isotope have the same energy, a characteristic that enables scientists to identify which gamma emitters are present in a sample. Gamma rays penetrate tissue farther than do beta or alpha particles, but leave a lower concentration of ions in their path to potentially cause cell damage. Gamma rays are very similar to x-rays. See also neutron.
  
Source: Centers for Disease Control and Prevention (CDC) ( About )