"Each year, millions of cargo containers from around the world are shipped to U.S. ports, holding in their metal 'bellies' a variety of essential goods such as food and textiles. While this method of importing freight is necessary for the nation's livelihood, monitoring the contents in such a vast volume of containers poses a challenge to homeland security experts. The events of September 11, 2001, brought transportation security issues into the limelight, including the need to ensure that cargo containers coming into U.S. ports are not carrying clandestine fissile materials. One of the difficulties scientists face in developing detection technologies for homeland security is how to accurately and efficiently identify hidden nuclear materials without significantly slowing commerce or, worse, bringing it to a halt. With funding from a grant through the University of California (UC) Office of the President, Livermore physicist Marie-Anne Descalle and UC Berkeley collaborators are studying the effectiveness of a radiographic imaging technique for use as a primary screening tool to rapidly scan cargo shipments."
Lawrence Livermore National Laboratory: https://www.llnl.gov/
Science & Technology Review (January/February 2010)