MRI for the airport
The device works by measuring relaxation times of protons exposed to magnetic fields. Because the energy of the fields is so much smaller than used by traditional MRI, the relaxation time is obtained with extremely sensitive magnetic-field detectors called superconducting quantum interference devices, or "squids," which are cooled to liquid-helium temperatures.
August 19, 2009 11:58 AM PDT
Photo by: Contributed by R&D Magazine
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