Te 129m 
Mo 99 
Cs 136 
Ru 106/Rh 106 
Ce 141 
Ce 144/Pr 144 
Zr 95 
Nb 95 
Ag 110m 
33.6 
2,74 
13 
372 
32.5 
284 
64 
35 
249 
days 
The share of the activity of Sr 90 and Tritium played only an insig- 
nificant role in the Fallout. The share of Sr 90 in the Fallout was 
not exactly determinable in seawater samples, because it lies within 
the deviation range of the values ascertained before the accident. 
The activity concentrations of Cm 242 surmounts those of Pu 239. The 
daughter isotope of Cm 242 is Pu 238, with a half-life of 87 years. 
Temporal Survey 
28.04.1986 
29.04.1986 
Receipt of the first information concerning radio- 
active Fallout in Sweden and Finland, in the 
evening newscasts. 
Instructions to the Research Vessel "Gauss", at that 
time in the Baltic Proper, to take water samples and 
continuous total Gamma-radiation measurements in the 
surface water. 
Precautionary water sampling at Light Vessel 
"Pehmarnbelt”". 
Gamma-spectrometrical investigation of a grass 
sample in the vicinity of the Institute in 
Hamburg-Sülldorf (no increased contamination). 
Commencement of the exchange of information with 
domestic and foreign institutes. 
30.04.1986 
Telex from the German Weather Service, by order of 
the Federal Minister of the Interior, with the re- 
quest for additional special measurements. 
Investigation of a further grass sample (no 
increased contamination). 
32.05.1986 
Commencement of the regular taking of water samples