These gamma rays, called MEGa-rays (for mono-energetic gamma rays), are made by using a beam of fast-movingelectronsto convert laser photons (light at a lesser energy) into the gamma ray part of thespectrum. The incoherent gamma rays can be tuned to a specific energy so that they predominantly interact with only one kind of material.
A beam of MEGa-rays, for example, might be absorbed by thenuclear fueluranium-235 while passing through other substances including the more common (but less dangerous) isotope uranium-238. That sort of precision opens the door to“nuclear photonics,” the study of nuclei with light.“It is kind of like tunable laser absorption spectroscopy but withgamma-rays,” says Chris Barty of Lawrence Livermore National Laboratory, who will present on MEGa-rays at this year's Conference on Lasers and Electro Optics (CLEO: 2011, May 1- 6 in Baltimore).
In the last couple of years, MEGa-ray prototypes have identified elements like lithium and lead hidden behind metal barriers. The next-generation of MEGa-ray machines, which should come on-line in a couple of years, will be a million times brighter, allowing them to see through thick materials to locate specific targets in less than a second.
Barty will present several MEGa-ray applications in use today and will describe the attributes of next-generation devices. Work is under way on a MEGa-ray technology that could be placed on a truck trailer and carried out into the field to check containers suspected of having bomb material in them. At nuclear reactors, MEGa-rays could be used to quickly identify how enriched a spent fuel rod is inuranium-235. They could also examine nuclear waste containers to assess their contents without ever opening them up. MEGa-ray technology might also be employed in medicine to track drugs that carry specific isotope markers.
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