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In page Nuclear weapon design:
"Some isotopes of protactinium, neptunium, americium, curium, californium, berkelium, and einsteinium have calculated critical mass values, ranging in the kilograms to tens of kilograms. Few possess an adequate combination of high fission cross section (for detonation), low spontaneous fission rate (to limit predetonation), low alpha or gamma decay rate (to allow handling).[citation needed]
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