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Sigma 20


A specific category of nuclear weapon data that pertains to “crude, simple or innovative” improvised nuclear device designs, concepts, and related manufacturing or processing pathways. Not all INDs are Sigma 20.

A specific category of NWD pertaining to “crude, simple, or innovative” improvised nuclear device designs, concepts, and related manufacturing or processing pathways. Not all INDs are covered under the Sigma 20 category (see DOE Classification Guide for Improvised Nuclear Devices for further details).

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