It has a radioactive decay half-life of about eight days. It is associated with nuclear energy, medical diagnostic and treatment procedures, and natural gas production. It also plays a major role as a radioactive isotope present in nuclear fission products, and was a significant contributor to the health hazards from open-air atomic bomb testing in the 1950s, and from the Chernobyl disaster, as well as being a large fraction of the contamination hazard in the first weeks in the Fukushima nuclear crisis.It was first found near the Norway Russia border in January 2017. Perhaps there is a nuclear site near there. It also appeared in Finland, Poland, Czechia (Czech Republic), Germany, France and Spain but details of the problem were only release recently.
Source
ScienceAlert.
