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Releases of caesium-137 from Sellafield


4.2 Releases of substances that are hazardous to health or the environment will be eliminated.


Estimated risk of releases from selected foreign sources that may affect Norway
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Are we moving in the right direction? Published by the Norwegian Radiation Protection Authority

The caesium-137 discharges from Sellafield were very high during 1975-1980. The highest discharge was registered in 1975 (5200 TBq). This is equivalent to the total fallout of caesium-137 to the Baltic Sea after the Chernobyl accident in 1986.

The discharges are now at a much lower level. Two new treatment plants at Sellafield in 1986 resulted in a considerable reduction in discharges. In recent years the yearly discharges to the Irish Sea have been less than 10 TBq caesium-137. In 2016, the discharges were 3.72 TBq.