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Latest Gamma ray Stories

2011-09-09 11:43:02

Two remarkable pulsed-power machines used to test the nation's defenses against atomic weapons have surpassed milestones at Sandia National Laboratories: 4,000 firings, called 'shots,' on the Saturn accelerator and 9,000 shots on the HERMES III accelerator. Saturn – originally projected to last 5 to 10 years – began operating in 1987. Its major function has been to produce X-rays to test the effectiveness of countermeasures used to protect electronics and other materials...

2011-08-24 17:20:43

Cardiologists who perform heart operations using x-ray guided catheters are exposed to ionizing radiation at levels two to three times higher per year than those experienced by radiologists. Now, new research has found the first evidence that these constant, high levels of exposure cause changes at cell level that might represent the body's way of protecting itself against the harmful effects of radiation. The research, published online today in the European Heart Journal, found that among...

2011-08-23 21:40:18

Sunbathers have long known that melanin in their skin cells provides protection from the damage caused by visible and ultraviolet light. More recent studies have shown that melanin, which is produced by multitudes of the planet's life forms, also gives some species protection from ionizing radiation. In certain microbes, in particular some organisms from near the former nuclear reactor facilities in Chernobyl, melanin has even been linked to increased growth in the presence of ionizing...

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2011-05-04 08:54:16

MESSENGER carries a Gamma-Ray Spectrometer (GRS) that is capable of measuring and characterizing gamma-ray emissions from the surface of Mercury. Just like radio waves, visible light, and X-rays, gamma rays are a form of electromagnetic radiation, but with higher energies than those other types of radiation. Gamma rays coming from Mercury carry information about the concentrations of elements present on its surface, so observations from the MESSENGER GRS are being used to determine the...

2011-04-26 15:14:51

Research to be presented at CLEO: 2011 highlights latest advances in laser science The world's foremost researchers in laser science, optoelectronics and quantum optics will present their findings at the Conference on Lasers and Electro-Optics (CLEO: 2011), May 1 "“ 6 at the Baltimore Convention Center. The more than 1,700 presentations at the conference will cover areas from energy and biophotonics to ultrafast lasers and quantum communication. Below is a sampling of the premiere...

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2011-01-11 09:00:00

NASA scientists have discovered beams of antimatter being produced by thunderstorms here on Earth--a phenomenon that had never been observed before, the US space agency said on Monday. It is believed that the antimatter particles were formed in a terrestrial gamma-ray flash, or TGF. According to a NASA press release, about 500 of these lightning-related events occur each day, but most of them are undetected. This one was spotted using NASA's Fermi Gamma-ray Space Telescope. "These signals are...

2011-01-10 16:30:00

WASHINGTON, Jan. 10, 2011 /PRNewswire-USNewswire/ -- Scientists using NASA's Fermi Gamma-ray Space Telescope have detected beams of antimatter produced above thunderstorms on Earth, a phenomenon never seen before. (Logo: http://photos.prnewswire.com/prnh/20081007/38461LOGO) Scientists think the antimatter particles were formed in a terrestrial gamma-ray flash (TGF), a brief burst produced inside thunderstorms and shown to be associated with lightning. It is estimated that about 500 TGFs...

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2010-11-29 10:01:39

Just like archaeologists, who rely on radioactive carbon to date the organic remains from past epochs, astronomers have exploited the radioactive decay of an isotope of aluminum to estimate the age of stars in the nearby Scorpius-Centaurus association, the closest group of young and massive stars to the Sun. The new observations, performed in gamma rays by ESA's INTEGRAL observatory, provide evidence for recent ejections of matter from massive stars that took place only a few million years...

2010-11-22 07:58:00

System Would Safely Detect Ionization of Air Surrounding Containers Holding Radioactive Material COLLEGE PARK, Md., Nov. 22, 2010 /PRNewswire-USNewswire/ -- The shipment of cargo containers is a critical component of international trade and plays a fundamental role in the global economy. According to the U.S. Bureau of Customs and Border Protection, about 90 percent of the world's trade is transported in cargo containers, with almost half of incoming U.S. trade arriving by containers...

2010-11-09 20:43:05

University of Maryland researchers propose method to sniff out dirty bombs via the electromagnetic breakdown of air Researchers at the University of Maryland have proposed a scheme for detecting a concealed source of radioactive material without searching containers one by one. Detection of radioactive material concealed in shipping containers is important in the early prevention of "dirty" bomb construction. The concept, described in the Journal of Applied Physics, is based on the gamma-ray...


Latest Gamma ray Reference Libraries

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2004-10-19 04:45:43

Gamma-Ray Astronomy -- Gamma-ray astronomy is the astronomical study of gamma rays. Long before experiments could detect gamma rays emitted by cosmic sources, scientists had known that the universe should be producing these photons. Work by Feenberg and Primakoff in 1948, Hayakawa and Hutchinson in 1952, and, especially, Morrison in 1958 had led scientists to believe that a number of different processes which were occurring in the universe would result in gamma-ray emission. These...

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2004-10-19 04:45:41

Hypernova -- A hypernova is a theoretical type of supernova produced when exceptionally large stars collapse at the end of their lifespan. In a hypernova, the core of the star collapses directly into a black hole and two extremely energetic jets of plasma are emitted from its rotational poles at nearly light speed. These jets emit intense gamma rays, and are a candidate explanation for gamma ray bursts. Theorists have come up with several plausible explanations for hypernovae. It may...

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2004-10-19 04:45:41

Electromagnetic Spectrum -- The electromagnetic spectrum describes the various types of electromagnetic radiation based on their wavelengths. Radio, representing wavelengths from a few feet to well over a mile, is at one end of the spectrum. Gamma ray radiation is at the other end: the wavelength of the harder types is so short, in the subatomic range, that we do not have instruments capable of directly measuring it. While the above classification scheme is generally accurate, in...

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Word of the Day
bibliopole
  • A bookseller; now, especially, a dealer in rare and curious books.
This word comes from a Greek phrase meaning 'book seller.'
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