Concentrations of thorium and uranium in freshwater samples collected in the former USSR Shiraishi, K; Nakajima, T [National Inst. of Radiological Sciences, Nakaminato, Ibaraki (Japan). Marine Radioecological Research Station]; Igarashi, Y [Meteorological Research Inst., Tsukuba, Ibaraki (Japan)]; Yamamoto, M [Kanazawa Univ. (Japan)]; Los, I P; Zelensky, A V; Buzinny, M Z [Ucrainin Scientific Center of Radiation Medicine, Kiev (Ukraine). Lab. of Radioecology] 54 ENVIRONMENTAL SCIENCES; 21 SPECIFIC NUCLEAR REACTORS AND ASSOCIATED PLANTS; THORIUM 232; ICP MASS SPECTROSCOPY; URANIUM ISOTOPES; CHERNOBYLSK-4 REACTOR; FRESH WATER; RADIOMETRIC ANALYSIS; REACTOR ACCIDENTS; SAMPLING; UKRAINE; ACCIDENTS; ACTINIDE ISOTOPES; ACTINIDE NUCLEI; ALPHA DECAY RADIOISOTOPES; CHEMICAL ANALYSIS; EASTERN EUROPE; ENRICHED URANIUM REACTORS; EUROPE; EVEN-EVEN NUCLEI; GRAPHITE MODERATED REACTORS; HEAVY NUCLEI; HYDROGEN COMPOUNDS; ISOTOPES; LWGR TYPE REACTORS; MASS SPECTROSCOPY; NUCLEI; OXYGEN COMPOUNDS; POWER REACTORS; QUANTITATIVE CHEMICAL ANALYSIS; RADIOISOTOPES; REACTORS; SPECTROSCOPY; SPONTANEOUS FISSION RADIOISOTOPES; THERMAL REACTORS; THORIUM ISOTOPES; WATER; WATER COOLED REACTORS; YEARS LIVING RADIOISOTOPES; 540330* - Environment, Aquatic- Radioactive Materials Monitoring & Transport- (1990-); 570100 - Health & Safety- Real Accidents- (1992-) Approximately 100 freshwater samples were collected in Ukraine, Russia, and Belorussia with regard to the Chernobyl accident. Thorium and uranium were determined by both quantitative and semiquantitative analysis modes of inductively coupled plasma mass spectrometry (ICP-MS). Thorium-232 was detected in only a few samples. Uranium concentrations ranged from non-detectable to 1,000 ng/ml. Mean and median concentrations of [sup 238]U were found to be 30.7[+-]139 and 0.7 ng/ml, respectively. The isotope ratio of [sup 234]U/[sup 238]U ranged from 4,6 x 10[sup -5] to 4,4 x 10[sup -4]. Mean ratio of [sup 235]U/[sup 238]U was 0.00721[+-]0.00006 (n=27). (author) 17 refs.; 1 fig.; 5 tabs. Hungary 1994-11-01 English Journal Article Journal Name: Journal of Radioanalytical and Nuclear Chemistry; (Switzerland); Journal Volume: 185:1 Medium: X; Size: Pages: 157-165 https://doi.org/10.1007/BF02042962 [] 185:1 Journal ID: ISSN 0236-5731; CODEN: JRNCDM INIS; AIX-26-028988; EDB-95-046906 2010-12-30 6524093