What are the typical specific activities of the radioactive particles found to date in the marine and coastal environment at Dounreay?
The range of particle specific activities, based on caesium-137 analysis measured so far is 1.43E07 to 1.85E10 Bq/g, Particles are normally characterised on their caesium-137 content. The more ‘active’ particles on the seabed and foreshore tend typically to be of the order of 1.0E6 MBq (1 MBq) to 1.0E8 Bq (100 MBq), whereas particles located and recovered from Sandside beach are, to date of much lower activity, less than 5.0E5 Bq (0.5 MBq)).
