Nuclear experts are still puzzling over a mysterious event that happened in June, when several monitoring stations in northern Europe detected extremely small quantities of radionuclides in the atmosphere. That event was not a nuclear weapons test, because the CTBTO stations did not detect any seismic activity. So what was it? Experts have scrutinized the radiation signature and narrowed down the possibilities. The finger points to Russia.
Bulletin of Atomic Scientists 21st Aug 2020 read more »