10 
The deep-water series down to near-bottom 
(5,300 m) were carried out, on all cruises, mainly 
in the area at 42° N to 43° N and 14° W to 15° W 
which was assigned for the first experimental dump- 
ing (effected in 1967) of packaged radioactive wastes. 
In order to provide better recognition of the verti- 
cal distribution of the !27cs ana sr, the activity 
csoncentration values found in these samples are re 
produced for the individual cruises separately in 
Figs. 104 to 113, 
At the other stations, normally, water samples 
were taken down to 1,250 m depth only. The three- 
dimensional distribution of the measurement data 
from these samples is represented graphically in the 
Figs. 114 to 118, 
Deep-water Investigations 
The highest activity concentration values in the 
surface region of over 0,3 pCi/l for 15705 and over 
9.2 pCi/1l for 90er, was measured at the beginning of 
the work during the year 1966. Down to about 200 m 
depth the measurement values of the different stations 
showed smaller concentration variations in both direc- 
tions, After that, there followed a quicker fall in 
soncentration, down to about 800 m depth, of about a 
tenth of the surface values, Below 800 m, down to 
near-bottom at 5,300 m, the values remained practi“— 
cally constant (Figs. 106 and 107). As a result of 
the relatively small water sample volumes taken, the 
measurement values taken in deeper water depths during 
1966 certainly lie so close to the limit of detection, 
that —- below 800 m — they cannot be viewed as abso- 
lutely representative. As, however, 900g and 15708 
in bottom fauna — originating from 5,300 m depth =