With rockets propelling it down the sled track at Sandia National Laboratories, a semitrailer loaded with mock nuclear weapons slammed into a barrier. It took mere moments to complete the second and final full-scale crash test of the Mobile Guardian Transporter, a next-generation system that will carry nuclear weapons and other sensitive materials for the Department of Energy’s Office of Secure Transportation.

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Argonne researchers study the movement of dust particles from concrete surfaces during a simulated radiological contamination scenario, measuring how pedestrians and moving cars affect the spread of the particles.

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