Frank Barnaby
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"Frank Charles Barnaby" is Nuclear Issues Consultant to the Oxford Research Group, a freelance defence analyst, and a prolific author on military technology, based in the UK.

Barnaby trained as a nuclear physicist and worked at the Atomic Weapons Research Establishment, Aldermaston, between 1951 and 1957. He was on the senior scientific staff of the Medical Research Council (UK) when a university lecturer at University College London (1957–67). Barnaby was Director of the Stockholm International Peace Research Institute (SIPRI) from 1971–81. He was a Professor at the VU University Amsterdam 1981–85, and awarded the Harold Stassen Chair of International Relations at the University of Minnesota in 1985.

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Those impurities do muck up your centrifuges. It's not a problem if you want 3.5 percent enriched uranium for power plants, but if you go to 90 percent these impurities are a major problem.

Those impurities do muck up your centrifuges. It's not a problem if you want 3.5% enriched uranium for power plants, but if you go to 90% these impurities are a major problem.

A vast percentage of centrifuges have to be rejected in testing, up to 60% rejection.