The Swedish Radiation Safety Authority reports Swedish measurement values to the IAEA

On 23 June, the Swedish Radiation Safety Authority reported that low levels of the radioisotopes caesium-134, caesium-137, cobalt-60 and ruthenium-103 had been measured in Sweden during calendar week 24. The levels measured pose no risk to human health or the environment.

The final measurement results from the national air filter stations for calendar week 24 are now ready. There are also provisional measurement results for calendar week 25 from the national air filter stations. These saw the detection of low levels of additional radioisotopes, namely ruthenium-106, niobium-95 and zirconium-95. Furthermore, the Swedish Defence Research Agency (FOI) has reported that similar levels of caesium-134, caesium-137 and ruthenium-103 were measured at the CTBTO station in Stockholm during the period 22-23 June.  

The International Atomic Energy Agency (IAEA) has asked Member States to report any measurement results for caesium and ruthenium and whether there is knowledge of any event in the Member State that caused the detections reported. The Swedish Radiation Safety Authority has responded to a request from the IAEA.

It is not possible at present to determine the origin of the values measured. No incident that may have caused these detections has been reported in Sweden. Similar measurement results have also been reported in Finland and Estonia. The levels measured are so low that they pose no risk to human health or the environment.

Measurement results

Final measurement results from Visby for calendar week 24, 8-15 June. All measurement results are stated in microBq/m3.

Caesium-134 Caesium-137 Ruthenium-103 Cobalt-60
0,8 1,3 0,1 0,2

Provisional measurement results from Visby for calendar week 25, 15-22 June. All measurement results are stated in microBq/m3.

Caesium-134 Caesium-137 Ruthenium-103 Cobalt-60 Ruthenium-106 Niobium-95 Zirconium-95
0,6 0,7 0,7 0,4 1,4 1,0 0,7

No elevated levels were measured during the period at any other national air filter stations.

Measurement results from the CTBTO station in Stockholm for 22-23 June. All measurement results are stated in microBq/m3.

Caesium-134 Caesium-137 Ruthenium-103
9,7 9,6 4,3

For more information, please contact: Swedish Radiation Safety Authority press office, tel. +46 8 799 40 20.