A mysterious increase in radiation levels over northern Europe was detected this month by authorities from several countries, although no nation has yet come forward to claim responsibility for the anomaly.

The subtle radiation spike-at levels that are considered harmless to humans, but significant enough to be picked up by radiation monitoring stations-began to make headlines last week, with European authorities announcing new readings of human-made radionuclide particles in the atmosphere. Similar observations were also made by radiation protection authorities in Norway and Finland.

"Very low levels of the radioactive substances cesium-134, cesium-137, cobalt-60 and ruthenium-103 were measured," the Swedish Radiation Safety Authority tweeted on Tuesday. "The levels measured are so low that they pose no danger to people or the environment."

Later in the week, Lassina Zerbo, the Executive Secretary of the Comprehensive Nuclear-Test-Ban Treaty Organisation, tweeted a map outlining the possible source region of the anomaly, most of which was territory inside Russia, but also parts of Finland, Sweden, Denmark, and Norway.

[Source:https://www.sciencealert.com/unexpected-radiation-spike-detected-over-europe-authorities-say]

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