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Adj.1.nonfissile - not fissile
fissile - capable of being split or cleft or divided in the direction of the grain; "fissile crystals"; "fissile wood"
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All the examined nonfissile materials, even when considered of 0.1 cm thickness, were found to be able to provide a strong reduction of the reference thermal neutron component.
Note: (a.) Fissile plutonium (Pu 239 and Pu 241) is typically about 60 percent of total plutonium, which includes nonfissile isotopes of plutonium (Pu 240 and Pu 242).
(6) Plutonium that contains at least 20 percent of the nonfissile isotopes Pu-240Reactor-grade plutonium is 65% fissile (by thermal neutrons) compared with 93% fissile for weapon-grade material.