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How do you prove someone tested a nuclear weapon? Researchers, Steven Czyz, Lily Ranjbar, and Salam Alhawsawi from the Radiation Detection Group at Oregon State are developing devices smaller than Pop-Tarts that use the metallic alloy CZT to detect radioactive isotopes of the noble gas xenon. This helps prove if someone tested a weapon, supporting the Comprehensive Nuclear-Test-Ban Treaty (CTBT) that's been signed by 183 nation states.