X-ray fluorescence
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In x-ray fluorescence the technology illuminates the ground with x-rays that causes a series of changes in the electron configuration of the target atoms that results in the release of an x-ray photon (x-ray fluorescence). X-ray fluorescence detects molecules of explosive that are emitted from the mine. The amount of fluorescence is dependent on the target molecule. A critical issue in dispute at the present time is whether x-ray fluorescence can work at the distances required to address countermine missions. The short wavelength of the x-rays used has a corresponding high degree of scattering. Several experts we spoke to expressed reservations about standoff for this technology, although the system developer claims to have surmounted this limitation.

