42 
those of %sp in the deeper water depths during the 
year 1968 amounted to several times higher than those 
values of 1966. 
The 15708 activity concentration values measured 
between the surface and 1,000 m depth (Fig, 110a) 
during 1970 in the region of the first dumping area 
(42° N to 43° N, 14° N to 15° W) were unchanged as 
compared with those of 1968, The surface value for 
70Sr lay lower than in 1968 (Fig. 110b), but — down 
to a depth of 500 m = showed no decrease, Between 
500 m and 1,000 m the values lay again at the same 
height as those of 1968. In 1970, no samples were 
taken from depths below 1,000 m, 
In 1972, the activity concentration values at 
the surface once again decreased about 30 % compared 
with those of 1968. Two of the deep-water stations 
in the main working area which were carried out on 
21st and 22nd November, resp., showed a rapid de- 
crease of the activity concentrations down to 50 m 
depth, and below that — as far as 500 m — fairly 
uniform values of 127cs (Fig. 111). Between 500 m 
and 1,000 m, there again occurred a stronger decrease 
in concentration of about 60 % to 65 %. Then, in con- 
trast to 1968, there followed a further 65 % decrease 
in values between 1,000 m and 2,000 m depth,. From 
2,000 m downwards to the near-bottom, the values then 
stayed at approximately the same levels, The vertical 
distribution of 0 showed a largely analogous trend 
(Fig, 112). 
The repetition of one of those stations on 
rd December = that is, 14 days later - led to extreme- 
ly divergent results (Fig, 111). With practically 
equal initial activity concentrations at the surface, 
a massive increase in concentration of about 55 %