Gamma ray


Also found in: Dictionary, Thesaurus, Acronyms, Encyclopedia, Wikipedia.
Related to Gamma ray: Gamma ray detector

Gamma ray

A high-energy photon, emitted by radioactive substances.
Gale Encyclopedia of Medicine. Copyright 2008 The Gale Group, Inc. All rights reserved.
References in periodicals archive ?
The CTA, launched in 2006 as an international joint research project, will conduct observations of gamma rays with a level of sensitivity aiming at ten times that of existing gamma ray telescopes.
The integrated gamma ray yields of chlorine for the eight gamma rays as a function of chlorine concentration in the saline water samples are shown in Figures 4 and 5 where the experimental data points for each gamma ray are superimposed on the Monte Carlo calculated yield of the respective gamma ray.
Gamma rays originate in processes in an atom's nucleus.
In the United States, three types of ionizing radiation have been approved for irradiating food: gamma rays, high energy electrons, which are sometimes referred to as electron beams (or e-beams), and X-rays.
It is important that the gamma rays emitted are low energy as the procedure is diagnostic and the tissue should not be damaged from the radiation exposure.
Like radio waves, visible light, and X rays, gamma rays are a form of electromagnetic radiation.
The recoil is then vanishingly slight, and the gamma ray wavelength shows no spread due to that recoil.
The time of flight information from the CsI detectors allows the [gamma]-ray asymmetry [A.sub.[gamma]] with respect to the neutron spin direction to be deduced as a function of incident neutron energy from the angular distribution: [[d[omega]]/[d[OMEGA]]] = [1/4[eth]] (1 + [A.sub.[gamma]] cos[theta]), where [theta] is the angle between the neutron spin and the direction of emission of the gamma ray. [A.sub.[gamma]] should be constant for all of the cold neutrons in the beam, but the experimental asymmetry will reflect the energy dependence of the beam polarization as illustrated in Fig.
"The cluster of stars also harbours a rare, extremely magnetic, neutron star known as a magnetar, but we think the gamma ray emission could be linked to the luminous blue variable star.
The NPDGamma [gamma]-ray detector has been built to measure, with high accuracy, the size of the small parity-violating asymmetry in the angular distribution of gamma rays from the capture of polarized cold neutrons by protons.
Summary: TEHRAN (FNA)- Astronomers have published the results of 15 years of gamma ray observations of the Milky Way.
Fermi's Large Area Telescope (LAT) recorded one gamma ray with an energy of at least 94 billion electron volts (GeV), or some 35 billion times the energy of visible light, and about three times greater than the LAT's previous record.