caa a22 4500 605538948 CHVBK 20210128100904.0 cr unu---uuuuu 210128e20150601xx s 000 0 eng 10.1007/s11053-014-9248-6 doi (NATIONALLICENCE)springer-10.1007/s11053-014-9248-6 Laboratory Enrichment of Radioactive Assemblages and Estimation of Thorium and Uranium Radioactivity in Fractions Separated from Placer Sands in Southeast Bangladesh [Elektronische Daten] [Takayuki Sasaki, Mohammad Rajib, Masafumi Akiyoshi, Taishi Kobayashi, Ikuji Takagi, Toshiyuki Fujii, Md. Zaman] 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 40K. The maximum values of 232Th and 238U, estimated from the radioactivity of 208Tl and 234Th in secular equilibrium, were found to be 152,000 and 63,300Bq/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. International Association for Mathematical Geosciences, 2014 Placer sand nationallicence Thorium nationallicence Uranium nationallicence Gamma-ray measurement nationallicence Bangladesh nationallicence Sasaki Takayuki Department of Nuclear Engineering, Kyoto University, Kyoto daigaku-Katsura C3, Nishikyo, 615-8540, Kyoto, Japan aut Rajib Mohammad Nuclear Minerals Unit, Atomic Energy Research Establishment, Bangladesh Atomic Energy Commission, Ganakbari, Savar, PO Box-3787, 1000, Dhaka, Bangladesh aut Akiyoshi Masafumi Department of Nuclear Engineering, Kyoto University, Kyoto daigaku-Katsura C3, Nishikyo, 615-8540, Kyoto, Japan aut Kobayashi Taishi Department of Nuclear Engineering, Kyoto University, Kyoto daigaku-Katsura C3, Nishikyo, 615-8540, Kyoto, Japan aut Takagi Ikuji Department of Nuclear Engineering, Kyoto University, Kyoto daigaku-Katsura C3, Nishikyo, 615-8540, Kyoto, Japan aut Fujii Toshiyuki Research Reactor Institute, Kyoto University, Kumatori-cho, Sennan-gun, 590-0494, Osaka, Japan aut Zaman Md Nuclear Minerals Unit, Atomic Energy Research Establishment, Bangladesh Atomic Energy Commission, Ganakbari, Savar, PO Box-3787, 1000, Dhaka, Bangladesh aut Natural Resources Research Springer US; http://www.springer-ny.com 24/2(2015-06-01), 209-220 1520-7439 24:2<209 2015 24 11053 https://doi.org/10.1007/s11053-014-9248-6 text/html Onlinezugriff via DOI BK010053 XK010053 XK010000 Metadata rights reserved Springer special CC-BY-NC licence nationallicence 1 research-article jats NATIONALLICENCE NATIONALLICENCE NL-springer NATIONALLICENCE 856 40 https://doi.org/10.1007/s11053-014-9248-6 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Sasaki Takayuki Department of Nuclear Engineering, Kyoto University, Kyoto daigaku-Katsura C3, Nishikyo, 615-8540, Kyoto, Japan aut NATIONALLICENCE 700 1- Rajib Mohammad Nuclear Minerals Unit, Atomic Energy Research Establishment, Bangladesh Atomic Energy Commission, Ganakbari, Savar, PO Box-3787, 1000, Dhaka, Bangladesh aut NATIONALLICENCE 700 1- Akiyoshi Masafumi Department of Nuclear Engineering, Kyoto University, Kyoto daigaku-Katsura C3, Nishikyo, 615-8540, Kyoto, Japan aut NATIONALLICENCE 700 1- Kobayashi Taishi Department of Nuclear Engineering, Kyoto University, Kyoto daigaku-Katsura C3, Nishikyo, 615-8540, Kyoto, Japan aut NATIONALLICENCE 700 1- Takagi Ikuji Department of Nuclear Engineering, Kyoto University, Kyoto daigaku-Katsura C3, Nishikyo, 615-8540, Kyoto, Japan aut NATIONALLICENCE 700 1- Fujii Toshiyuki Research Reactor Institute, Kyoto University, Kumatori-cho, Sennan-gun, 590-0494, Osaka, Japan aut NATIONALLICENCE 700 1- Zaman Md Nuclear Minerals Unit, Atomic Energy Research Establishment, Bangladesh Atomic Energy Commission, Ganakbari, Savar, PO Box-3787, 1000, Dhaka, Bangladesh aut NATIONALLICENCE 773 0- Natural Resources Research Springer US; http://www.springer-ny.com 24/2(2015-06-01), 209-220 1520-7439 24:2<209 2015 24 11053