[en] The Sellafield plant on the north-west coast of England is emitting radioactive substances into the Irish Sea. Many of these substances are transported with the ocean currents into the North Sea, then along the coast of Norway to the polar regions. In 1994 the emissions of the long-lived radioactive substance technetium 99 increased strongly. However, for most of the radioactive substances today's emissions are considerably less than the emissions in the 1970s and the 1980s. The present concentrations in the marine environment do not represent any health hazard as far as is known today. Nevertheless, Norwegian authorities are putting pressure on the British in order to reduce the emission of long-lived substances such as technetium 99. This is because it is technically possible to reduce the emissions and because it is not known how these substances behave in the maritime environment