Ruthenium 106, Zirconium 95, and Potassium 40 at selected
ocean stations (1960-1965) / Riel, G. K. ; Pedrick, R. A. ;
Attaway, D. H. ; Audet, J. J., Jr. Naval Ordnance Lab White Oak MD,
1965.. - 48s.
'The concentrations of Potassium 40, Ruthenium-Rhodium 106, and Zirconium-Niobium 95 in the ocean have been measured by insitu gamma spectrometry at several Western North Atlantic and a few Eastern North Pacific sites between 1960 and 1965. The concentration of natural potassium 40 is proportional to salinity and close to reported average values. The zirconium-niobium 95 activity is due to fallout from nuclear weapons and decreased markedly after the test ban treaty. The ruthenium-rhodium 106 concentration reported is too high to be entirely due to nuclear tests, and shown no rational pattern with time or depth.'