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|Title:||Analysis of terrestrial natural radionuclides in soil samples and assessment of average effective dose|
Sonkawade, R G
External gamma dose
|Abstract:||Radionuclides that are present in soil significantly affect terrestrial gamma radiation levels which in turn can be used for the assessment of terrestrial gamma dose rates. Natural radioactivity analysis has been done for the soil samples collected from different villages/towns of Hoshiarpur district of Punjab, India. The measurements have been carried out using HPGe detector based on high-resolution gamma spectrometry system. The calculated activity concentration values for terrestrial gamma viz. <sup>238</sup>U, <sup>232</sup>Th and <sup>40</sup> K have been found to vary from 8.89 to 56.71 Bq kg<sup>−1</sup>, from 137.32 to 334.47 Bq kg<sup>−1</sup> and from 823.62 to 1064.97 Bq kg<sup>−1</sup>, respectively. The total average absorbed dose rate in the study areas is 185.32nGyh<sup>−1</sup>. The calculated value of average radium equivalent activity (401.13 Bq kg<sup>−1</sup>) exceeds the permissible limit (370 Bqkg<sup>−1</sup>) recommended by Organization for Economic Corporation and Development (OECD). The calculated average value of external hazard index (<i style="">H</i><sub>ex</sub>) is 1.097. The calculated values of Indoor and Outdoor annual effective doses vary from 0.61 to 1.28 mSv and from 0.15 to 0.32 mSv, respectively. A positive correlation (<i>R</i><sup>2</sup>=0.71) has also been observed for concentration of <sup>232</sup>Th and <sup>40</sup>K.|
|ISSN:||0975-1041 (Online); 0019-5596 (Print)|
|Appears in Collections:||IJPAP Vol.48(11) [November 2010]|
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