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Title: <smarttagtype namespaceuri="urn:schemas-microsoft-com:office:smarttags" name="country-region"><smarttagtype namespaceuri="urn:schemas-microsoft-com:office:smarttags" name="place"><smarttagtype namespaceuri="urn:schemas-microsoft-com:office:smarttags" name="City"> Study of radon exhalation rate and natural radioactivity in soil samples collected from East Singhbhum Shear Zone in Jaduguda U-Mines Area, Jharkhand, India and its radiological implications </smarttagtype></smarttagtype></smarttagtype>
Authors: Mahur, A K
Kumar, Rajesh
Mishra, M
Ali, S A
Sonkawade, R G
Singh, B P
Bhardwaj, V N
Prasad, Rajendra
Keywords: Natural radioactivity
HPGe low level radiation counting system
Radium equivalent activity
Absorbed gamma dose rates
Issue Date: Jul-2010
Publisher: CSIR
Abstract: <smarttagtype namespaceuri="urn:schemas-microsoft-com:office:smarttags" name="country-region"><smarttagtype namespaceuri="urn:schemas-microsoft-com:office:smarttags" name="place"> In the present study, Sealed Can Technique was adopted for radon exhalation measurements in soil samples collected from some areas around the East Singhbhum shear zone in U-mining area of Jharkhand state of India. Radon activity varies from 3794.3 to 4891.4 Bqm<sup>-3</sup> with an average value of 4368.6 Bqm<sup>-3 </sup>while radon exhalation<sup> </sup>rate varies from 1364.1 to 1758.6 mBqm<sup>-2</sup>h<sup>-1</sup> with an average value of 1573.8 mBqm<sup>-2</sup>h<sup>-1</sup><sub>.</sub> Activity concentrations of naturally occurring radionuclides (<sup>238</sup>U, <sup>232</sup>Th and <sup>40</sup>K) were also measured in these soil samples using high resolution γ-ray spectroscopic system. Activity concentrations were found to vary from 6.1 ± 0.2 to 826.3 ± 8.5 Bq kg<sup>-1</sup> for <sup>238</sup>U, 8.7 ± 0.3 to 236.7 ± 3.2 Bq kg<sup>-1</sup> for <sup>232</sup>Th and 291.5 ± 4.4 to 1391 ± 14.3 Bq kg<sup>-1</sup> for <sup>40</sup>K. From the activity concentration of <sup>238</sup>U, <sup>232</sup>Th and <sup>40</sup>K in these soil samples, the radium equivalent activity (Ra<sub>eq</sub>) due to the presence of radionuclides is calculated and it varies from 34.0 to 924.5 Bq kg<sup>-1</sup> with an average value of 260.4 Bq kg<sup>-1</sup>. Total absorbed gamma dose rates in the surrounding air are found to vary from 15.1 to 402.0 nGyh<sup>-1</sup> with an average value of 120.8 nGyh<sup>-1</sup>. The indoor and outdoor annual effective dose rates from these soil samples are determined from 0.1 to 1.9 mSv y<sup>-1</sup> and 0.03 to 0.8 mSv y<sup>-1</sup>, respectively. External hazard index, <i>H</i><sub>ex</sub> for the soil samples studied in this work ranges from 0.14 to 2.46 with a mean value of 0.70. The internal exposure to <sup>222</sup>Rn and its radioactive progeny are controlled by the internal hazard index <i>H</i><sub>in</sub>. Computed values of <i>H</i><sub>in</sub> vary from 0.2 to 4.8 with an average value of 1.02. </smarttagtype></smarttagtype>
Description: 486-492
ISSN: 0975-1041 (Online); 0019-5596 (Print)
Appears in Collections:IJPAP Vol.48(07) [July 2010]

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