As I started this debate with an article in on February 3, 2012, I would like to correct a number of misunderstandings and maybe clarify a little bit more a story that might appear complicated for people not specialized in radionuclide analyses.
My analysis was reinforced when new data appeared and when I also considered trapping of the xenon precursors antimony and tellurium in the analysis. In this article, I will try to describe the evidence below starting from the strongest argument and continue through arguments that some people might consider doubtful, unless they manage to see the whole picture.
The obvious filter would be the rocks surrounding the test cavity of an underground test. The ratio between the 140 and 141 activities could be used to calculate that it took a little less than ten seconds from the time of the explosion until the gases were injected into the atmosphere, an analysis that further supports the potential scenario. There is already enough evidence for an underground nuclear explosion, which is why I did not check too many other “” sources.
I was criticized for that, but later a paper was published by Christopher Wright, which very carefully did this exercise, showing that there were no alternatives.
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An official news flash from North Korea around midnight on May 11/12, 2010, reporting about a successful nuclear fusion experiment on April 15, suggested a hypothesis to solve the dilemma.