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their negative (Lewis) and inconclusive (Wit and Ahn with some additional indications via satellite imagery) views on whether or not the North Koreans actually carried out a low-yield nuclear test in May 2010.
Radionuclide Detections First and foremost, the evidence that a nuclear explosion was carried out underground in East Asia came from detections of barium-140 and lanthanum-140 at a CTBT filter station at Okinawa (Japan). Later, traces of cerium-141 were also noted in re-measurements at certified laboratories.
Lanthanum-140 was detected at the CTBT station at Ussuriysk (Russia) as well, which virtually excluded that the source was to be found locally at Okinawa.
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Below is a recent list of 2017 articles that have had the most social media attention.
It is not correct to say, as Lewis does, that I have concluded my first paper was in error.
After my first paper, I started to think about fractionation phenomena in a cavity that cools down after an explosion.
Radiological imaging techniques include x-rays, CT scans, PET scans, MRIs, and ultrasonograms.
Doing the ratio analysis for the Geojin observation showed that the resulting scenario required a clear detection of metastable xenon-133 (xenon-133m), but as there was none, it was difficult to marry the mass 140 and 133/135 detections into a common event.
But as the former was globally unique and the latter locally unique for the stations, it was reasonable to further consider that they actually derived from the same source.
The second evidence was that longer-lived xenon isotopes (xenon-133 with a half-life of 5.243 days and xenon-135 with a half-life of 9.14 hours) were detected at a national noble gas station at Geojin in the northeastern corner of South Korea and at a CTBT station at Takaski (Japan).
Both employ SAUNA (Swedish Automated and Unattended Noble gas Analyser) analysers.