gamma ray


  • WordNet 3.6
    • n gamma ray electromagnetic radiation emitted during radioactive decay and having an extremely short wavelength
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Webster's Revised Unabridged Dictionary
    • n Gamma ray (Physics) A very penetrating electromagnetic ray not appreciably deflected by a magnetic or electric field, emitted by radioactive substances. Gamma rays are photons of electromagnetic radiation having a wavelength shorter than that of X-rays, (i. e. shorter than 0.1 nanometer) and are correspondingly more penetrating than X-rays. In addition to being given off in certain types of radioactive decay, they may be found in cosmic radiation, though they are largely absorbed by the earth's atmosphere. Gamma-ray detectors orbited above the atmosphere have found bursts of gamma radiation, in some cases associated with visually observed supernova explosions, but in most cases from unidentified sources.
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In literature:

Some of the radium products give out alpha-rays only, one beta- and gamma-rays, while one yields all three types of radiation.
"Darwin and Modern Science" by A.C. Seward and Others
Beta rays, nature of, 246; accompanied by gamma rays, 247; production of, by gamma rays, 247; as ionising agents, 249.
"The Birth-Time of the World and Other Scientific Essays" by J. (John) Joly
That was the dangerous kind, because both beta particles and gamma rays could penetrate clothing and skin.
"Rip Foster in Ride the Gray Planet" by Harold Leland Goodwin
Sir Ernest Rutherford christened them, after the first three letters of the Greek alphabet, the Alpha, the Beta, and Gamma rays.
"The Outline of Science, Vol. 1 (of 4)" by J. Arthur Thomson
It certainly can't be anything less than gamma rays and probably even of greater frequency.
"Islands of Space" by John W Campbell
The men will be protected against the gamma rays.
"The Ultimate Weapon" by John Wood Campbell
The Gamma rays were here, unmistakable!
"Astounding Stories of Super-Science April 1930" by Various
Gamma rays were bombarding it!
"Astounding Stories of Super-Science, March 1930" by Various
Professor E. Rutherford has named these rays beta (B), alpha (a), and gamma (v) rays respectively.
"A History of Science, Volume 5(of 5)" by Henry Smith Williams
Somewhere in Cairo there must be a company that used X-ray or gamma-ray photography to check large castings.
"The Egyptian Cat Mystery" by Harold Leland Goodwin

In news:

GLAST will perform full sky surveys every three hours taking in gamma -rays from around the universe.
Decoding A Great Earth Die-Off: Was A Gamma-Ray Burst Really The Trigger.
Can gamma-ray bursts destroy life on Earth.
The red spot at the center of this image, based on data collected from March 10 to 29, represents what scientists believe is a gamma-ray nova.
The brightest gamma-ray burst ever seen in X-rays temporarily blinded Swift's X-ray Telescope on 21 June 2010.
The Gamma-Ray Large Area Space Telescope, renamed Fermi, was launched in June and is off to a promising start, NASA scientists said.
The study is a follow-up on work done by the Energetic Gamma-Ray Experiment Telescope, a mission that studied gamma ray s from 1991 to 2000.
Thus, they are called soft gamma-ray repeaters.
Scientists discover a young and energetic neutron star that experienced the strongest rotation glitch ever observed for a gamma-ray-only pulsar.
Inactivation of lymphadenopathy-associated virus by heat, gamma rays, and ultraviolet light.
Is it a gamma-ray burst.
Although the Swift satellite was designed specifically to study gamma-ray bursts, the instrument was not designed to handle an X-ray blast this bright.
There are two theories about how the gamma rays in these bursts are generated.
A view of the universe from NASA's Fermi Gamma-ray Space Telescope.
"The Effect of Gamma Rays" at Palm Beach Dramaworks: A Great Actress Strikes the Wrong Notes.

In science:

Gamma-ray light curves differ significantly from those in X-rays, optical, and radio.
Neutron Stars as Sources of High Energy Particles - the case of RPP
Bertsch, D. L., Dame, T. M., Fichtel, C. E., Hunter, S. D., Sreekumar, P., Stacy, J. G., and Thaddeus, P., Diffuse Gamma-Ray Emission in the Galactic Plane from Cosmic-Ray, Matter, and Photon Interactions, Astrophysical Journal, 461, 2, 587–600, Oct 1993.
A Search for Gamma-Ray Bursts and Pulsars, and the Application of Kalman Filters to Gamma-Ray Reconstruction
The X-ray data, together with the gamma-ray EGRET detection recently published by Mukherjee et al. (2002), define a further peak at high energies.
The nuclear SED of NGC6251: a BL Lac in the center of an FR I radio galaxy
We studied the X-ray and optical absorption properties of 13 Gamma Ray Burst afterglows observed by BeppoSAX.
Absorption in Gamma Ray Burst afterglows
Polarization measurements in the X-ray and gamma-ray energy range can provide crucial information on massive compact ob jects such as black holes and neutron stars.
Beam Test of a Prototype Detector Array for the PoGO Astronomical Hard X-Ray/Soft Gamma-Ray Polarimeter