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Radionuclides and Radiation Indices of High Background Radiation Area in Chavara-Neendakara Placer Deposits (Kerala India)

机译:在Chavara-Neendakara砂矿高本底地区的放射性核素和辐射指标(印度喀拉拉邦)

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摘要

The present paper describes a detailed study on the distribution of radionuclides along Chavara – Neendakara placer deposit, a high background radiation area (HBRA) along the Southwest coast of India (Kerala). Judged from our studies using HPGe gamma spectrometric detector, it becomes evident that Uranium (238U), Thorium (232Th) and Potassium (40K) are the major sources for radioactivity prevailing in the area. Our statistical analyses reveal the existence of a high positive correlation between 238U and 232Th, implicating that the levels of these elements are interdependent. Our SEM-EDAX analyses reveal that titanium (Ti) and zircon (Zr) are the major trace elements in the sand samples, followed by aluminum, copper, iron, ruthenium, magnesium, calcium, sulphur and lead. This is first of its kind report on the radiation hazard indices on this placer deposit. The average absorbed dose rates (9795 nGy h−1) computed from the present study is comparable with the top-ranking HBRAs in the world, thus offering the Chavara-Neendakara placer the second position, after Brazil; pertinently, this value is much higher than the World average. The perceptibly high absorbed gamma dose rates, entrained with the high annual external effective dose rates (AEED) and average annual gonadal dose equivalent (AGDE) values existing in this HBRA, encourage us to suggest for a candid assessment of the impact of the background radiation, if any, on the organisms that inhabit along this placer deposit. Future research could effectively address the issue of the possible impact of natural radiation on the biota inhabiting this HBRA.
机译:本文描述了沿Chavara – Neendakara砂矿床(印度西南海岸(喀拉拉邦)的高背景辐射区(HBRA))的放射性核素分布的详细研究。根据我们使用HPGe伽马能谱探测器进行的研究判断,很明显铀( 238 U),Thor( 232 Th)和钾( 40 K)是该地区盛行的主要放射源。我们的统计分析揭示了 238 U和 232 Th之间存在高度正相关,暗示这些元素的水平是相互依赖的。我们的SEM-EDAX分析表明,钛(Ti)和锆石(Zr)是砂样品中的主要微量元素,其次是铝,铜,铁,钌,镁,钙,硫和铅。这是有关该矿床沉积物的辐射危害指数的同类报道。根据本研究计算出的平均吸收剂量率(9795 nGy h −1 )与世界上排名最高的HBRA相当,从而使Chavara-Neendakara砂矿位居第二,仅次于巴西。与此相关的是,该值远高于世界平均水平。该HBRA中存在较高的可吸收伽玛剂量率,以及较高的年度外部有效剂量率(AEED)和平均年度性腺等效剂量(AGDE)值,这鼓励我们建议对背景辐射的影响进行坦率评估(如果有的话)存在于该砂矿中的生物。未来的研究可以有效地解决自然辐射可能对居住在该HBRA上的生物群产生影响的问题。

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