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Re:Google Funding Construction of Seven U.S. Nuclear Reactors by credit_guy on Tuesday October 15, 2024 @08:05AM (#41847664)
> traces of tritium from the two-step activation of beryllium

Also from the 6Li absorption of 1 neutron. The Lithium used is almost pure 7Li, at 99.995%. But there is still 50 ppm 6Li in it.

Re:Google Funding Construction of Seven U.S. Nuclear Reactors by pfdietz on Tuesday October 15, 2024 @08:31AM (#41847881)
Yes. The inescapable tritium production from Be sets the lower bound on how pure the 7Li has to be.