COPENHAGEN, Jan 30, 2026, 18:31 CET
- Finland’s nuclear safety watchdog reported finding trace amounts of radioactive substances in air samples but confirmed there is no danger to the public.
- The agency confirmed the material wasn’t from Finnish nuclear power plants but didn’t clarify where it originated.
- Mid-January samples from three sites showed detectable levels of multiple radioactive isotopes.
Finland’s nuclear safety authority reported on Friday that it found trace amounts of radioactive substances in air samples. However, officials stressed the levels detected do not pose any threat to public health. 1
This finding is significant because even minuscule, detectable traces can trigger alarms near a region packed with nuclear power plants. Plus, air-monitoring systems exist precisely to catch any releases early—whether from normal operations or something more serious.
STUK, the Radiation and Nuclear Safety Authority, confirmed the substances didn’t come from Finnish nuclear power plants but didn’t clarify why they appeared.
The agency reported that particle samples collected in mid-January from Rovaniemi in the north, as well as Kuopio and Imatra in the east, showed levels above the detection limit — the minimum amount a lab method can consistently detect. 2
STUK reported finding radioactive manganese (Mn-54), iron (Fe-59), and cobalt (Co-60) in Rovaniemi. In Kuopio, only cobalt showed up, while the Imatra sample contained manganese, iron, cobalt, and niobium (Nb-95), according to the agency.
STUK explained that these substances can form while nuclear power plants are running and might escape into the air during maintenance. They also noted that pinpointing the origin of such low-level detections is often impossible.
Finland, Sweden, and Russia all run nuclear power reactors, and depending on weather and release conditions, air masses can transport trace amounts of material across great distances in the region.
STUK operates air-sampling stations at eight locations across Finland. These stations pull in large volumes of air, trapping particles on filters for analysis to identify the substances present. 3
The agency didn’t point to a probable source for the recent detections. Nor did it mention any operational incidents at foreign plants tied to the findings.
The main question remains the origin: without knowing where the particles came from, officials can’t determine if this was a one-time maintenance release, a transport event concentrating trace materials over Finland, or something that might happen again. An increase in levels or the detection of other, shorter-lived isotopes would trigger closer examination, but STUK assured that this incident posed no risk.
