Assertion: plutonium | /r/HasProperty | the most common choice
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Source sentences:
text: Plutonium is the most common choice, but e.g. the Violet Club bomb and Orange Herald warhead used massive hollow pits, consisting of 87 and 117 kg (98 and 125 kg according to other sources) of highly enriched uranium.
text: Plutonium and uranium in grades normally used in nuclear weapons are the most common examples.