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Title: Laboratory Enrichment of Radioactive Assemblages and Estimation of Thorium and Uranium Radioactivity in Fractions Separated from Placer Sands in Southeast Bangladesh

The present study reports the likely first attempt of separating radioactive minerals for estimation of activity concentration in the beach placer sands of Bangladesh. Several sand samples from heavy mineral deposits located at the south-eastern coastal belt of Bangladesh were processed to physically upgrade their radioactivity concentrations using plant and laboratory equipment. Following some modified flow procedure, individual fractions were separated and investigated using gamma-ray spectrometry and powder-XRD analysis. The radioactivity measurements indicated contributions of the thorium and uranium radioactive series and of {sup 40}K. The maximum values of {sup 232}Th and {sup 238}U, estimated from the radioactivity of {sup 208}Tl and {sup 234}Th in secular equilibrium, were found to be 152,000 and 63,300 Bq/kg, respectively. The fraction of the moderately conductive part in electric separation contained thorium predominantly, while that of the non-conductive part was found to be uranium rich. The present arrangement of the pilot plant cascade and the fine tuning of setting parameters were found to be effective and economic separation process of the radioactive minerals from placer sands in Bangladesh. Probable radiological impacts and extraction potentiality of such radioactive materials are also discussed.
Authors:
 [1] ;  [2] ; ; ;  [1] ;  [3] ;  [2]
  1. Kyoto University, Department of Nuclear Engineering (Japan)
  2. Bangladesh Atomic Energy Commission, Nuclear Minerals Unit, Atomic Energy Research Establishment (Bangladesh)
  3. Kyoto University, Research Reactor Institute (Japan)
Publication Date:
OSTI Identifier:
22469912
Resource Type:
Journal Article
Resource Relation:
Journal Name: Natural Resources Research (New York, N.Y.); Journal Volume: 24; Journal Issue: 2; Other Information: Copyright (c) 2015 International Association for Mathematical Geosciences; http://www.springer-ny.com; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
54 ENVIRONMENTAL SCIENCES; 58 GEOSCIENCES; BANGLADESH; COASTAL REGIONS; CONCENTRATION RATIO; EQUILIBRIUM; GAMMA SPECTROSCOPY; POTASSIUM 40; RADIOACTIVE MINERALS; RADIOACTIVITY; THALLIUM 208; THORIUM; THORIUM 232; THORIUM 234; URANIUM; URANIUM 238; X-RAY DIFFRACTION