A LiCl in D2O solution might also work as a neutron moderator plus energy extractor. With a molecular weight of 42.39 and solubility of 1300 g/l, that's about .21 g/cm^3 of lithium. The problem with LiCl is the 3x10^5 half life of 36Cl. LiBr looks better. LiI also has high solubility but some unfortunate byproducts.

Horace Heffner

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