Radioactivity Levels and Gamma-Ray Dose Rate in Soil Samples from Kohistan (Pakistan) Using Gamma-Ray Spectrometry

  • Received Date: June 09, 2010
  • Published Date: December 31, 2010
  • The analysis of naturally occurring radionuclides (226Ra, 232Th and 40K) and an anthropogenic radionuclide 137Cs is carried out in some soil samples collected from Kohistan district of N.W.F.P. (Pakistan), using gamma−ray spectrometry. The gamma spectrometry is operated using a high purity Germanium (HPGe) detector coupled with a computer based high resolution multi channel analyzer. The specific activity in soil ranges from 24.72 to 78.48 Bqkg−1 for 226Ra, 21.73 to 75.28 Bqkg−1 for 232Th, 7.06 to 14.9 Bqkg−1 for 137Cs and 298.46 to 570.77 Bqkg−1 for 40K with the mean values of 42.11, 43.27, 9.5 and 418.27 Bqkg−1, respectively. The radium equivalent activity in all the soil samples is lower than the safe limit set in the OECD report (370 Bqkg−1). Man-made radionuclide 137Cs is also present in detectable amount in all soil samples. Presence of 137Cs indicates that the samples in this remote area also receive some fallout from nuclear accident in Chernobyl power plant in 1986. The internal and external hazard indices have the mean values of 0.48 and 0.37 respectively. Absorbed dose rates and effective dose equivalents are also determined for the samples. The concentration of radionuclides found in the soil samples during the present study is nominal and does not pose any potential health hazard to the general public.
  • Article Text

  • [1] Hutchison S G and Hutchison F I 1997 J. Chem. Edu. 74 501
    [2] Khan H M et al 1997 J. Nucl. Sci. 34 209
    [3] Khan H M et al 1994 J. Chem. Soci. Pak. 16 183
    [4] UNSCEAR 2000 Sources and Effects of Ionizing Radiation (New York: United Nations Scientific Committee on the Effect of Atomic Radiation)
    [5] Vandecasteele C M 2004 J. Environ. Radioactivity 72 17
    [6] Rowan D J et al 1998 J. Environ. Radioactivity. 40 15
    [7] Khan H M et al 1995 J. Nucl. Sci. 32 249
    [8] Tahir et al 2006 Radiat Prot. Dosim. 118 345
    [9] Khan H M et al 2010 Water Air Soil Pollut. 213 353
    [10] Khan K et al 2003 International Conference on Isotopic and Nuclear Analytical Techniques for Health and Environment (Vienna, Austria 10–13 June 2003) IAEA-CN-103/005P
    [11] Khan K et al 2010 Chin. Phys. Lett. 27 039301
    [12] Chaudhry Z S et al 2002 J. Radioanal. Nucl. Chem. 253 497
    [13] IAEA 1989 Measurement of Radionuclide in Food and Environment (Vienna: International Atomic Energy Agency) p 27
    [14] Fredj A B et al 2005 Radiat Prot. Dosim. 117 419
    [15] Beretka J and Mathew P J 1995 Health Phys. 48 87
    [16] OECD 1979 Exposure to radiation from natural radioactivity in building materials (Paris: Organization for Economic Cooperation and Development Nuclear Energy Agency)
    [17] Gallyas M and Torok I 1984 Radiat Prot. Dosim. 7 69
    [18] UNSCEAR 1988 Sources and Effects of Ionizing Radiation (New York: United Nations Scientific Committee on the Effect of Atomic Radiation)
    [19] Hamid B N et al 2002 Radiat Prot. Dosim. 98 227

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