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paper, the essential results of the measurements of Chernobyl Fallout nuclides, carried out by the Deutsches Hydrographisches Institut in 1986, are to be presented and discussed. RESULTS AND DISCUSSION The input of the Fallout from Chernobyl into the Sea took place via the atmosphere, whereby a large-scale and time synoptic monitoring became necessary. After the accident had become known, the DHI therefore took water samples immediately as a precaution at several positions in the North Sea and the Baltic Sea, in order to investigate them as soon as possible for radioactive contamination. Aerosol investigations carried out in Hamburg simultaneously provided data about the time of the arrival of the radioactive cloud and about its nuclide composition. The nuclide pattern was ascertained by Gamma spectroscopy. Hereby, the relative activity of the most important nuclides in the analyzed aerosols, in relation to Cs 137 on the 5th/6th May, are given in the following table: Nuclide Rel. activity Half-life Cs 137 1.00 30 years Cs 134 0.52 754 days Ru 103 2.00 39.3 days Ru 106 0.75 368 days Ba/La 140 0.67 12.8 days I 131 6.00 8.0 days Te/I 132 2.30 3.2 days Some further nuclides, such as Sr90, Pu239/240, Pu238, Am241, Np239, Cm 242, Te 129m, Mo/Tc 99, Cs 136, Ce 141, Ce/Pr 144, Zr/Nb 95, Ag 110m, were detectable in lesser concentration in different samples from the region of the sea. The DHI's radiological measurement network (positions of the measuring network station are given in Fig 1.) delivered the first information about radioactive precipitation into the sea at 3 May at the station Light Vessel "Borkumriff" at 21.00 hrs. after the set in of thunder showers. The input into the southern North Sea occurred from west to east direction by the movement of a thunder front. The input into the western Baltic was detected at the 5 May at station Fehmarnbelt. The input into the Baltic Proper was registered at 29 May by the travelling station RV GAUSS, which was in the area south of Gotland. At that time no direct input by rain of the Fallout into the water took place in this area. It merely concerned precipitation from aerosols and fog.
DOI link for paper, the essential results of the measurements of Chernobyl Fallout nuclides, carried out by the Deutsches Hydrographisches Institut in 1986, are to be presented and discussed. RESULTS AND DISCUSSION The input of the Fallout from Chernobyl into the Sea took place via the atmosphere, whereby a large-scale and time synoptic monitoring became necessary. After the accident had become known, the DHI therefore took water samples immediately as a precaution at several positions in the North Sea and the Baltic Sea, in order to investigate them as soon as possible for radioactive contamination. Aerosol investigations carried out in Hamburg simultaneously provided data about the time of the arrival of the radioactive cloud and about its nuclide composition. The nuclide pattern was ascertained by Gamma spectroscopy. Hereby, the relative activity of the most important nuclides in the analyzed aerosols, in relation to Cs 137 on the 5th/6th May, are given in the following table: Nuclide Rel. activity Half-life Cs 137 1.00 30 years Cs 134 0.52 754 days Ru 103 2.00 39.3 days Ru 106 0.75 368 days Ba/La 140 0.67 12.8 days I 131 6.00 8.0 days Te/I 132 2.30 3.2 days Some further nuclides, such as Sr90, Pu239/240, Pu238, Am241, Np239, Cm 242, Te 129m, Mo/Tc 99, Cs 136, Ce 141, Ce/Pr 144, Zr/Nb 95, Ag 110m, were detectable in lesser concentration in different samples from the region of the sea. The DHI's radiological measurement network (positions of the measuring network station are given in Fig 1.) delivered the first information about radioactive precipitation into the sea at 3 May at the station Light Vessel "Borkumriff" at 21.00 hrs. after the set in of thunder showers. The input into the southern North Sea occurred from west to east direction by the movement of a thunder front. The input into the western Baltic was detected at the 5 May at station Fehmarnbelt. The input into the Baltic Proper was registered at 29 May by the travelling station RV GAUSS, which was in the area south of Gotland. At that time no direct input by rain of the Fallout into the water took place in this area. It merely concerned precipitation from aerosols and fog.
paper, the essential results of the measurements of Chernobyl Fallout nuclides, carried out by the Deutsches Hydrographisches Institut in 1986, are to be presented and discussed. RESULTS AND DISCUSSION The input of the Fallout from Chernobyl into the Sea took place via the atmosphere, whereby a large-scale and time synoptic monitoring became necessary. After the accident had become known, the DHI therefore took water samples immediately as a precaution at several positions in the North Sea and the Baltic Sea, in order to investigate them as soon as possible for radioactive contamination. Aerosol investigations carried out in Hamburg simultaneously provided data about the time of the arrival of the radioactive cloud and about its nuclide composition. The nuclide pattern was ascertained by Gamma spectroscopy. Hereby, the relative activity of the most important nuclides in the analyzed aerosols, in relation to Cs 137 on the 5th/6th May, are given in the following table: Nuclide Rel. activity Half-life Cs 137 1.00 30 years Cs 134 0.52 754 days Ru 103 2.00 39.3 days Ru 106 0.75 368 days Ba/La 140 0.67 12.8 days I 131 6.00 8.0 days Te/I 132 2.30 3.2 days Some further nuclides, such as Sr90, Pu239/240, Pu238, Am241, Np239, Cm 242, Te 129m, Mo/Tc 99, Cs 136, Ce 141, Ce/Pr 144, Zr/Nb 95, Ag 110m, were detectable in lesser concentration in different samples from the region of the sea. The DHI's radiological measurement network (positions of the measuring network station are given in Fig 1.) delivered the first information about radioactive precipitation into the sea at 3 May at the station Light Vessel "Borkumriff" at 21.00 hrs. after the set in of thunder showers. The input into the southern North Sea occurred from west to east direction by the movement of a thunder front. The input into the western Baltic was detected at the 5 May at station Fehmarnbelt. The input into the Baltic Proper was registered at 29 May by the travelling station RV GAUSS, which was in the area south of Gotland. At that time no direct input by rain of the Fallout into the water took place in this area. It merely concerned precipitation from aerosols and fog.
ABSTRACT
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