follow Dictionary.com

Do you know ghouls from goblins and ghosts?

gamma ray

noun, Physics.
1.
a photon of penetrating electromagnetic radiation (gamma radiation) emitted from an atomic nucleus.
2.
a photon emitted by an electron as a result of internal conversion.
3.
electromagnetic radiation with wavelengths shorter than approximately one tenth of a nanometer.
Origin
1900-1905
1900-05
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
Cite This Source
Examples from the web for gamma rays
  • gamma rays are electromagnetic radiation at the highest-energy, or shortest-wavelength, end of the electromagnetic spectrum.
  • The atomic bomb released two types of radiation, easily-detectable gamma rays and fast neutrons, which are harder to measure.
  • And he has yet another new technique at his disposal, capable of focusing trace amounts of gamma rays.
  • They are marked by a fleeting, powerful pulse of gamma rays.
  • Actually the underground nature of the experiment makes detection easier because gamma rays will be attenuated.
  • Exposure from x-rays or gamma rays is measured in units of roentgens.
  • The gamma knife uses gamma rays that are sent from multiple points to converge at a single point on the tumor.
  • But then strange things started popping up in laboratories: x-rays, gamma rays, a mysterious phenomenon called radioactivity.
  • gamma rays of this order can only be produced when matter fuses in such a collapse.
  • There can also be a flash of extremely high-energy gamma rays.
British Dictionary definitions for gamma rays

gamma rays

plural noun
1.
streams of gamma radiation
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
Cite This Source
gamma rays in Medicine

gamma ray n.
Electromagnetic radiation emitted from the nucleus of an atom by radioactive decay and having energies in a range from ten thousand (104) to ten million (107) electron volts.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
Cite This Source
gamma rays in Science
gamma ray  
A stream of high-energy electromagnetic radiation given off by an atomic nucleus undergoing radioactive decay. Because the wavelengths of gamma rays are shorter than those of x-rays, gamma rays have greater energy and penetrating power than x-rays. Gamma rays are emitted by pulsars, quasars, and radio galaxies but cannot penetrate the Earth's atmosphere. See more at radioactive decay.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
Cite This Source

Word of the Day

Difficulty index for gamma ray

Few English speakers likely know this word

Word Value for gamma

10
13
Scrabble Words With Friends