I recently heard the 20% LEU-HEU divide was proposed by US rep at an Atoms for Peace conf, following "experiments"(?) by AEC. @wellerstein
Reactor experiments, or critical mass? @alxglaser has some background in fn 1 here: http://www.princeton.edu/~aglaser/2005aglaser_why20percent.pdf …
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is the reason something about 20% is lowest enrichment that will support chain reactions sans moderator?
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No, it's actually lower than 20%, but the critical mass is ~400kg (1/2 ton) at 20% w/reflector
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Worthwhile noting that an Orange Herald scaled to Mark 1 diam would implode ~680 kg.
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This is more recent, with Atoms for Peace memo - http://scienceandglobalsecurity.org/archive/sgs24brown.pdf …
@CherylRofer@NuclearAnthro -
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