Data suggest that the country has experimented with a fusion boost to its fission weapons.
Geoff Brumfiel
03 February 2012
North Korea may have conducted two covert nuclear weapons tests in 2010, according to a fresh analysis of radioisotope data.
The claim has drawn scepticism from some nuclear-weapons experts. But if confirmed, the analysis would double the number of tests the country is known to have conducted and suggest that North Korea is trying to develop powerful warheads for its fledgling nuclear arsenal.
Read more at Nature
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