THE VARIATION OF THE FISSION PRODUCT CONTENT OF CYSTOSEIRA IN THE BLACK SEA (in Russian)
Samples of brown seaweed (Cystoseim barbata) were counted after ashing on end-window beta counters having window thicknesses of 1.5 and 5 mg/cm/sup 2/. The gamma -energies of the activities were also determined on a 99-channel gamma -scintillation counter equipped with a NaI(Tl) crystal 70 x 45 mm. Ssmples were taken from 1957 to May of 1960, and the activities were compared with a museum sample taken in 1939. The level of radioactivity in the sample increased from 1957 to a maximum in the summer and autum of 1959, and dropped sharply in 1960. An analysis of the gamma spectra showed that most of the radioactivity in the seaweed was due to the Ce/sup 144/-- Pr/sup 144/ peak at 130 kev energy. Smaller peaks due to Zr/sup 95/--Nb/sup 95/, Ru/sup 103/, Ru/sup 106/--Rh/sup 106/ and K/sup O/ are also observed. The activities in the ash in units of 10/sup - 10/ curies/g for seaweed. collected in September of 1959 were 3.00 for Ce/sup 144/ - Pr/sup 144/ 0.70 for Zr/sup 95/--Nb/sup 95/ 1.30 for Ru/sup 106/ and 0.70 for Ru/sup 106/--Rh/sup 106/. The figare for Ce/sup 144/-- Pr/sup 144/ had dropped to 0.17 for seaweed collected in November of 1960. The results indicate that fission products accumulate in seaweed, and are removed from the water, as the seaweed dies and settles out in the sediment. (TTT)
- Research Organization:
- Kovalevskii Sevastopol Biological Station and Sechenov Inst. of Evolutionary Physiology, Academy of Sciences, USSR
- NSA Number:
- NSA-18-004979
- OSTI ID:
- 4137408
- Journal Information:
- Doklady Akademii Nauk SSSR (U.S.S.R.) English translation currently published in a number of subject-oriented journals, Journal Name: Doklady Akademii Nauk SSSR (U.S.S.R.) English translation currently published in a number of subject-oriented journals Vol. Vol: 152; ISSN DANKA
- Country of Publication:
- Country unknown/Code not available
- Language:
- Russian
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Related Subjects
BETA DECAY
BIOLOGY AND MEDICINE
CERIUM 144
COUNTERS
CRYSTALS
DEPOSITS
ENERGY
FISSION PRODUCTS
GAMMA RADIATION
NIOBIUM 95
PIGMENTS
PLANTS
POTASSIUM 40
PRASEODYMIUM 144
RADIATION DOSES
RADIOACTIVITY
RESIDUES
RHODIUM 106
RUTHENIUM 103
RUTHENIUM 106
SAMPLING
SCINTILLATION COUNTERS
SEA
SEAWEEDS
SODIUM IODIDES
THICKNESS
VARIATIONS
WATER
WINDOWS
ZIRCONIUM 95