Spatial mapping and radiometric survey of high background radiation areas in Southern Tamil Nadu, India

Radiation Protection and Environment Pub Date : 2020-07-01 DOI:10.4103/rpe.rpe_47_20

K. Baskaran, K. Arunachalam

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引用次数: 3

Abstract

Southern Tamil Nadu has placer deposits, which is rich in minerals like zircon, garnet, monazite and rutile containing with radionuclides of U, Th and their decayed products. The present study is to identify the high background radiation areas in the regions of South west–east coast of Tamil Nadu. The ground radiometric survey was conducted in different seasons using portable radiation survey meter and global positioning system. Total of 137 observation spots were marked from 5 blocks for repeat measurements. Then calculated for the outdoor effective external terrestrial dose to the public residing in these blocks. The survey found average absorbed dose rate of block in this order 3>2> 4>1>5 (1394, 641, 247, 225, 167 nGy/h, respectively). From the data, a spatial mapping was performed for seasonal variation and interpolated for the unknown areas of dose rate. The outdoor effective dose to the public was found to be 1.66> 0.79>0.31>0.27>0.20 mSv/y with respective blocks. Conclusion: The dose to public was found to be lower, when compared with other high background radiation areas in the world. Therefore, there is no significant radiological risks to the public from natural radiation exposure.

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印度南部泰米尔纳德邦高本底辐射区的空间测绘和辐射测量

泰米尔纳德邦南部有砂矿矿床，富含锆石、石榴石、独居石和金红石等矿物，含有放射性核素U、Th及其衰变产物。本研究旨在确定泰米尔纳德邦西南-东海岸地区的高背景辐射区。利用便携式辐射测量仪和全球定位系统在不同季节进行了地面辐射测量。从5个块中标记总共137个观察点用于重复测量。然后计算居住在这些街区的公众的室外有效外部地面剂量。调查发现，阻断剂的平均吸收剂量率依次为3>2>4>1>5（分别为1394641247225167nGy/h）。根据数据，对季节变化进行了空间映射，并对剂量率的未知区域进行了插值。对公众的室外有效剂量为1.66>0.79>0.31>0.27>0.20 mSv/y。结论：与世界上其他高本底辐射地区相比，公众的剂量较低。因此，自然辐射暴露不会对公众造成重大辐射风险。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Radiation Protection and Environment

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审稿时长

15 weeks