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B 2 RADIOLOGICAL DATA (Kautsky) 
B 2,1 Method 
The investigations were carried out on unfilter- 
ed water samples; that is, on water including particles. 
With the exception of those samples which were worked«—- 
off on board immediately after taking, all those sam- 
ples which were kept in containers for storage, and 
also those samples which had been put through an ion- 
exchange column, were brought tö a value of about 2 pH 
by the addition of hydrochloric acid, 
All the samples taken in the year 1966 from dif- 
ferent depths for radiological investigation, had a 
uniform volume of 50 1, During the following years, 
in order to accommodate to the decreasing concentra- 
tion activity of !27cs with depth, different quanti- 
ties of water (each according to the sampling depth) 
were taken for the analyses. We took, from O0 to 100 m 
depths —- 50 1; at 250 and 500 m —- each 100 1; from 
750 to 1,250 m — each 200 1; at 1,500 m = 300 1; and 
from 2,000 m downwards —- 400 1 each per sample. For 
the sampling, we used a 50 1 sampler developed at our 
Institute or a Gerard-Ewing sampler of 270 1 content, 
which were very kindly placed at our disposal by the 
Institut für Umweltphysik of Heidelberg University. 
The 15768 in the 50 1 samples was determined 
according to the method of Schmitt and Kautsky (1961). 
At 100 1 samples onwards, we separated the 15708 over 
Potassiumhexacyanocobaltate-(II)-Ferrate-(II) (KCFC) 
as ion-exchanger. The subsequent working-off took 
place in the manner described by Eicke (1974). 
Blanks carried out with 60g KCFC (exchanger 
amount for one analysis) gave an activity of up to 
a maximum of 1 pCi 137605, In the case of a 100 1 
water sample, that would be equivalent to an activity