What is enriched uranium and why is it so hard to make?

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Enriched uranium is uranium processed to increase the concentration of the fissile isotope uranium-235 (U-235) beyond its natural abundance of 0.7%. Fissile refers to a material—specifically a nuclide—that can undergo nuclear fission when it absorbs a low-energy (thermal) neutron. This property is crucial because only fissile materials can sustain a self-sustaining nuclear chain reaction with…

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Top 120 cities at risk for a Nuclear, biological, nuclear (NBC/CBRN) attack

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A Chemical, biological, radiological, and nuclear attack, also known as a CBRN or NBC attack, is an attack against an area using hazardous material to promote widespread damage, typically utilized in a terrorist-type attack. The US Army’s domestic preparedness division lists the following cities/states as the top 120 cities at risk for a chemical, biological,…

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