7“ 
4.2.6 Tritium 
Owing to the fact that the determination of Tritium in a generally 
severely contaminated sample of the first rain shower in Hamburg 
after the accident indicated no significant increase compared with 
the Tritium concentrations previously normally found in rain, for 
the time being measurements of seawater sample were discontinued. 
Samples from the beginning of May analyzed later resulted in for: 
LV "Borkumriff” on 04.05. at 21.00 hrs 
LV "Elbe 1” on 06.05. at 10.30 hrs 
LV "Fehmarnbelt” on 11.05. at 08.20 hrs 
northwards of Rügen on 10.05. at 11.00 hrs 
1.99 Bq/l 
1.84 Ba/l 
4.52 Ba/l 
5.24 Bq/1 
Samples taken in the middle of August by RV "Gauss” in the German 
Bight likewise resulted in no striking concentrations (Table 4). The 
higher concentrations in the Baltic Sea, dependent upon salinity, 
were also observed in the earlier years. 
[nvestigations of the direct radiation burden in the 
sea region 
5.1 
Radiation burden from the sea upon ships 
On 06. May, a fouling sample was taken from the heavily fouled hull 
of Light Vessel "Elbe 1”, and investigated on 08.05. for total Gamma 
radiation. From that should be assessed if the ship's personnel were 
exposed to an unpermitted high radiation burden by the possible en- 
richment of radioactive substances in the seaweed. 
For the calculation, the "Allgemeine Berechnungsgrundlage"” (August 
1979), issued by the Minister of the Interior for the exposition- 
path (swimming/boating) was used as a basis. 
The estimation did not take into account the radioactive decay of 
short-lived nuclides, owing to the fact that a further enrichment of 
the seaweed activity at this time could not be excluded. Therefore, 
the outer radiation burden, which was referred to a year, was valid 
only for the moment. 
Basis of the assessment: 
Activity concentration of the seawater: 
Spec. Activity of the seaweed sample: 
20 Ba/l 
1.500 Ba/kg (wet)