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La scorta di 20 chili di plutonio di proprietà della Confederazione conservata presso l'Istituto Paul Scherrer di Villigen, nel canton Argovia, è stata trasferita negli Stati Uniti, tra gennaio e febbraio.
Il materiale, inizialmente destinato a sviluppare una nuova generazione di combustibile per centrali atomiche, era da decenni custodito in casseforti sorvegliate in permanenza.
Il Consiglio federale aveva deciso di liquidarlo nel 2014 per contribuire alla messa in sicurezza di tutte le riserve mondiali di elementi radioattivi e quale contributo elvetico alla non proliferazione nucleare. Allo scopo era stato firmato un accordo col Ministero dell'energia di Washington.
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