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      Spatial distribution of gamma radiation levels in surface soils from Jaduguda uranium mineralization zone, Jharkhand, India, using γ-ray spectrometry, and determination of outdoor dose to the population


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          The concentrations of natural radionuclides in surface soil samples around selected villages of Jaduguda were investigated and compared with the radioactivity level in the region. Concentrations of 238U, 232Th, and 40K were determined by a gamma ray spectrometer using the HPGe detector with 50% relative efficiency, and the radiation dose to the local population was estimated. The average estimated activity concentrations of 238U, 232Th, and 40K in the surface soil were 53.8, 44.2 and 464.2 Bq kg −1 respectively. The average absorbed dose rate in the study area was estimated to be 72.5 nGy h-1, where as the annual effective dose to the population was 0.09 mSv y-1. A correlation analysis was made between measured dose rate and individual radionuclides, in order to delineate the contribution of the respective nuclides towards dose rate. The radio-elemental concentrations of uranium, thorium and potassium estimated for the soils, in the study area, indicated the enrichment of uranium series nuclide. The results of the present study were subsequently compared with international and national recommended values.

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          Natural radioactivity and radiation exposure in the high background area at Chhatrapur beach placer deposit of Orissa, India.

          A high natural background radiation area is reported for the Chhatrapur beach placer deposit of Orissa state, on the southeastern coast of India, due to the presence of radiogenic heavy minerals. The average activity concentrations of radioactive elements 232Th, 238U and 40K were measured by gamma-ray spectrometry using a HPGe detector, and found to be 2500 +/-1850, 230 +/- 140 and 120 +/- 35 Bq kg-1, respectively, for the bulk sand samples. The absorbed gamma dose rates in air due to the naturally occurring radionuclides varied from 375 to 5000 nGy h-1, with an average value of 1625 +/- 1200 nGy h-1. The external annual effective dose rate of the region ranged from 0.46 to 6.12 mSv y-1, with an average value of 1625 +/- 1200 mSv y-1. The absorbed gamma dose rate levels of Chhatrapur beach area were similar to the monazite sand-bearing high background radiation areas of southern and southwestern coastal tracts of India and other similar areas of the world. The major contributors to the enhanced level of radiation are monazite and zircon sands.
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            Crustal evolution of Singhbhum North Orissa, Eastern India

            AK Saha (1994)
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              Determination of terrestrial gamma, 238U, 232Th and 40K in soil along fracture zones


                Author and article information

                J Med Phys
                Journal of Medical Physics / Association of Medical Physicists of India
                Medknow Publications (India )
                Oct-Dec 2010
                : 35
                : 4
                : 235-241
                Department of Geology & Geophysics, Indian Institute of Technology, Kharagpur, West Bengal, India
                [1 ]Radiation Safety Systems Division, Bhaba Atomic Research Center, Trombay, Mumbai, India
                Author notes
                Address for correspondence: Ms. Mandakini Maharana, Department of Geology & Geophysics, Indian Institute of Technology, Kharagpur – 721 302, West Bengal, India. E-mail: mm.geology@ 123456gmail.com
                © Journal of Medical Physics

                This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

                : 11 November 2009
                : 06 June 2010
                : 22 June 2010
                Technical Note

                Medical physics
                hpge,surface soil,natural radioactivity,gamma dose,singhbhum shear zone
                Medical physics
                hpge, surface soil, natural radioactivity, gamma dose, singhbhum shear zone


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