Figure A1. 
Results for K-40 with 2 sigma uncertainties 
(upper) and the arithmetic mean with variations of 
the result within 2 sigma uncertainties (lower). 
27 
Bq/kg Bq/kg 
K-40 
K-40 mean value 1006 Bq/kg 
Results with 2 sigma uncertainties 
Long-lived radionuclides in the seabed of the Baltic Sea