North Korea's Third Nuclear Test: Plutonium or Highly Enriched Uranium?"North Korea has only a small supply of plutonium?material that it had stopped producing by 2008?and had more recently demonstrated an operational capability to enrich uranium, which would support a much larger arsenal of weapons given North Korea's huge deposits of natural uranium.... However, the seismic signals are useless in this regard. The question is, then, can the off-site environmental sampling analysis distinguish a plutonium explosion from a HEU explosion?"
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