Radioactividade na Europa?

http://www.telegraph.co.uk/news/2017/11/10/harmless-radioactive-cloud-europe-may-have-come-nuclear-accident/

Citando:
"The ruthenium 106 was probably released in a nuclear fuel treatment site or centre for radioactive medicine, he said. Because of its short half-life of about a year, ruthenium 106 is used in nuclear medicine, for example in cancer therapy for eye tumours."