THE DISTRIBUTION OF CERIUM-144 AND RUTHENIUM-106 ABOVE THE ATLANTIC OCEAN (in Russian)
The oceanographic research ship Ob' which left Kaliningrad in November 1958 carried an air filtering apparatus with a capacity of 250 m/sup 3//hour; this apparatus was used for collecting samples of radioactive dust during the cruise. The activity of the dust was determined, after combustion of the filters, by means of a scintillation gamma -spectrograph provided with a fiat NaI(Tl) crystal for determining the 661-kev quanta. During the measurements carried out in June 1959 lines corresponding to Zr/sup 95/, Nb/sup 95/, Rh/sup 106/, Ce/sup 144 41/, and Ru/sup 103/ were observed. Repeated analysis of the same samples at the end of 1960 indicated the presence of Cs/sup 137/, Ru/sup 106/ , and Ce/sup 144/. The activities of the latt er two elements were quantitatively determined by counting the Compton electron pulses superimposed on photoelectron pulses with an error of less than 20%. Distribution of the concentration presents a minimum at the equator, possibly due to the rise of heated air masses. Radioactive contaminations near the equator may be due to tropospheric transfers. The highest concentrations were found at latitudes of 30 deg N and 15 deg S. The data do not agree completely with results obtained during the 1959 cruises of the research ship Vityaz in the Pacific and Atlantic Oceans. This might be due to the fact during 1959 only stratospherio fallout was observed while in 1958 the tropospheric fallout was also quite noticeable. Deposits north of 40 deg were mostly old. (TTT)
- Research Organization:
- Originating Research Org. not identified
- NSA Number:
- NSA-16-032719
- OSTI ID:
- 4770289
- Journal Information:
- At. Energ. (USSR), Journal Name: At. Energ. (USSR) Vol. Vol: 13
- Country of Publication:
- Country unknown/Code not available
- Language:
- Russian
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