From: Axil * Rossi could not have spiked the ash with Lithium 6 since access to that isotope is restricted to the same level of access as plutonium with both being proliferation control items.
Not so. Rossi could buy 6Li in kilograms if he so desired. Recent press release of interest: http://www.y12.doe.gov/global-security/lithium-based-technologies "The Y12 National Security Complex supplies lithium, in unclassified forms, to customers worldwide through the DOE Office of Science, Isotope Business Office. Historically, the typical order of 6Li was only gram quantities used in research and development. However, over the past three years demand has increased steadily with typical orders of around 10–20 kg each. Such increase in demand is a direct result of the use of 6Li in neutron detectors"
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