Can a gamma ray gun be far off?............
Posted on 09/19/2011 11:34:06 AM PDT by Red Badger
The brightest gamma ray beam ever created- more than a thousand billion times more brilliant than the sun- has been produced in research led at the University of Strathclyde- and could open up new possibilities for medicine.
Physicists have discovered that ultra-short duration laser pulses can interact with ionised gas to give off beams that are so intense they can pass through 20 cm of lead and would take 1.5 m of concrete to be completely absorbed.
The ray could have several uses, such as in medical imaging, radiotherapy and radioisotope production for PET (positron emission tomography) scanning. The source could also be useful in monitoring the integrity of stored nuclear waste.
In addition, the laser pulses are short enough- lasting a quadrillionth of a second- to capture the response of a nucleus to stimuli, making the rays ideal for use in lab-based study of the nucleus.
The device used in the research is smaller and less costly than more conventional sources of gamma rays, which are a form of X-rays.
The experiments were carried out on the Gemini laser in the Central Laser Facility at the Science and Technology Facilities Council's Rutherford Appleton Laboratory. Strathclyde was also joined in the research by University of Glasgow and Instituto Superior Técnico in Lisbon.
Professor Dino Jaroszynski of Strathclyde, who led the research, said: "This is a great breakthrough, which could make the probing of very dense matter easier and more extensive, and so allow us to monitor nuclear fusion capsules imploding.
"To prove this we have imaged very thin wires - 25 microns thick - with gamma rays and produced very clear images using a new method called phase-contrast imaging. This allows very weakly absorbing material to be clearly imaged. Matter illuminated by gamma rays only cast a very weak shadow and therefore are invisible. Phase-contrast imaging is the only way to render these transparent objects visible.
"It could also act as a powerful tool in medicine for cancer therapy and there is nothing else to match the duration of the gamma ray pulses, which is also why it is so bright.
"In nature, if you accelerate charged particles, such as electrons, they radiate. We trapped particles in a cavity of ions trailing an intense laser pulse and accelerated these to high energies. Electrons in this cavity also interact with the laser and pick up energy from it and oscillate wildly - much like a child being pushed on a swing. The large swinging motion and the high energy of the electrons allow a huge increase in the photon energy to produce gamma rays. This enabled the gamma ray photons to outshine any other earthbound source.
"The accelerator we use is a new type called a laser-plasma wakefield accelerator which uses high power lasers and ionised gas to accelerate charged particles to very high energies - thus shrinking a conventional accelerator, which is 100m long, to one which fits in the palm of your hand."
The peak brilliance of the gamma rays was measured to be greater than 1023 photons per second, per square milliradian, per square millimetre, per 0.1% bandwidth.
The research was supported by the Engineering and Physical Sciences Research Council, the Science and Technology Facilities Council, the Laserlab-Europe Consortium and the Extreme Light Infrastructure project. It is linked to SCAPA (Scottish Centre for the Application of Plasma-based Accelerators), which is based at Strathclyde and is run through the Scottish Universities Physics Alliance.
The research has been published in the journal Nature Physics.
Can a gamma ray gun be far off?............
Scientists? I’m STILL waiting for my flying car! Priorities, Please! :)
We'll have to wait for the entrepreneurs. The Wright Brothers were bicycle makers..............
Moeller has certainly set the bar high. He’s milked this one for almost a decade now... /g
Now, if they could turn that Gamma ray pulse into a Gamma Ray pulse LASER, THAT would be some weapon system.........
Usually to make gamma rays you have to use radiactive elements, sounds like they use a laser to pump energy into a gas which then releases gamma rays, neato!
XKCD response to the flying car demand.
Yes, and if they can do this in such a small space, and concentrate them into a beam................
The ray could have several uses...
Yeah, like cooking your Thanksgiving turkey in 6.4 seconds...!!
Really dudn’t sound like something I want my neighbor to start playin with!!!
Dr. David Banner can tell you this ends badly.
Just wait til the rednecks find out about this!.................
This is new to me. What nuclear reaction produces radio isotopes using gamma rays.
If I recall my high school physics correctly you have to add a neutron to make a new isotope.
How can a gamma ray do that?
Then we could save the earth. /extreme sarcasm
Well, if you cook your turkey in peanut oil you MIGHT burn down your house!
This puppy will take out the whole block!!
Wonder if my homeowners insurance covers “gamma rays brighter than a neutron star”?
Or take a neutron away.
Can a photon (gamma) do that?
Dunno. That why me Sarge and not Professor.
But it only mentions the methods I already knew of; nuclear bombardment by charged particles (adding neutrons), fission and nuclear decay.
Unless you can cause nuclear decay or fission by stimulating the nucleus with a gamma ray I am at a loss as how it is done.
These people treated with this technology will become The Incredible Hulk....we must shut down this dangerous research.
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