Early 20th century marked tremendous and fascinating discoveries in physics and chemistry. For the first time in human history hard evidence was produced supporting the existence of atoms. In his book Imagined Worlds, the eminent astrophysicist Freeman Dyson calls the changes in physics that occurred in the 1920 s, a concept-drivenrevolution; theory had primacy over experiment. Quantum mechanics and the theory of relativity explained atomic and nuclear structures. Yet, the technology for accessing the atomic and subatomic levels remained rather primitive. It was not until decades later that serious technological applications appeared.
Nuclear Material Homeland Security Cold Neutron Light Water Reactor Neutron Interaction
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