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References in periodicals archive ?
CTA will expand the visible horizon of the Universe with high-energy gamma rays and deliver information on dynamical and explosive phenomena, on the high energy radiation from supermassive black holes, and the newly born black holes.
In the present study, the multiple gamma-ray detection capabilities of a cylindrical 76 mm x 76 mm (diameter x height) Ce[Br.sub.3] detector were studied through chlorine concentration measurements in saline water samples utilizing eight chlorine prompt gamma rays [13] in conjunction with a portable neutron generator-based PGNAA setup [8, 12].
Radioactive atoms are unstable and give off various types of radiation; the types of use for nuclear detection are gamma rays and neutrons.
In the United States, all electronically irradiated food, whether processed with gamma rays, electron beams or X-rays must be labeled with the international symbol for irradiation, known as the radura, along with one of several phrases acceptable to FDA and USDA, such as "Treated with Radiation" or "Treated by Irradiation."
The second trial measured not only the attenuation of gamma rays through determined breast tissue thickness (as in trial one), but also took into consideration the change in distance between the source of radiation and the detector, since radiation intensity decreases with increasing distance from the source (Knoll 1989).
Then came CGRO, equipped with four sensitive instruments to observe and measure gamma rays. One of these, named the Burst and Transient Source Experiment (BATSE), was built by a team under Gerald Fishman at the Marshall Space Flight Center in Huntsville, Alabama.
Asymmetries associated with the [[right arrow].n] + p [right arrow] d + [gamma] reaction itself include effects of a small circular polarization of the gamma rays, and a left-right asymmetry arising from the correlation [s.sub.n] * ([k.sub.[gamma]] X [k.sub.n]), where [s.sub.n] is the neutron spin direction, [k.sub.[gamma]] and [k.sub.n] are the gamma ray and neutron propagation directions respectively--both have been examined and will lead to false asymmetries at the [10.sup.-10] level or smaller in the [A.sub.[gamma]] measurement.
But to be absolutely sure, we'll probably have to wait for far more sensitive gamma ray observations with the Cherenkov Telescope Array, the next gamma ray observatory now under construction in Chile."
The HESS Galactic Plane Survey (HGPS) catalog released today, four times larger than the previous one dating from 2006, will be of great value to the entire astrophysics community, who will for the first time be able to access a very high energy gamma ray data set of this size.
Through a variety of mechanisms, these speedy particles can lead to the emission of gamma rays, the most powerful form of light and a signal that travels to us directly from its sources.
The biggest hurdle facing any gamma-ray observatory is the relentless bombardment of cosmic rays, ultrafast charged particles (mostly protons) that resemble the particles produced by gamma rays. For every gamma ray that hits LAT, it will have to filter out 100,000 to 1,000,000 cosmic rays.