21. The Secure 1000 Backscatter X-ray scanner was developed in 1992 by Dr . Steve Smith. 22. This backscatter noise is used by network telescopes to indirectly observe large scale attacks in real time. 23. NASA also performed backscatter scanning of the lower liquid hydrogen / intertank flange stringers on 29 November. 24. Backscatter X-ray machines already are in use in South Africa to screen workers leaving diamond mines.25. In 2007 the Transportation Security Administration introduced the first of its backscatter X-ray machines at PHX. 26. By filtering out all the backscatter signal close to the original transmitted frequency, moving targets become visible. 27. A backscatter peak can be seen at channel 150, similar to the second peak in Figure 1. 28. Rapiscan manufactures a controversial Backscatter X-ray system for screening airport passengers, the Rapiscan Secure 1000. 29. The advanced application of the alternative diffraction technique of Electron Backscatter Diffraction ( EBSD ) overcomes these limitations. 30. A single backscatter scan exposes the target to between 0.05 and 0.1 microsievert of radiation.
