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首页> 外文期刊>Arabian Journal for Science and Engineering. Section A, Sciences >Titanium-Rich Beach Placers in As-Sufal, Hadhramout Coast
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Titanium-Rich Beach Placers in As-Sufal, Hadhramout Coast

机译：Hadhramout Coast As-Sufal的富含钛的海滩砂矿

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摘要

The accumulations of beach placers along the shoreline of Hadhramout at As-Sufal area have been prospected and analyzed for their radiogenic and chemical characteristics for the first time. The activity concentrations of Ra-226, Th-232, and K-40 in the beach placers' samples were measured by gamma-ray spectrometry using a 56% HPGe detector and found to be 1270 +/- 237, 2098 +/- 380, and 208 +/- 40 Bq kg(-1), respectively. The results established As-Sufal as a high natural background radiation area. The hazard indices predicted elevation of the external exposure of residents when sand soiled with beach placers from this area is used as a building material. Radium equivalents of beach placers were 8.6-14.3 times the maximum recommended for the safe use of materials in the construction of dwellings. The outdoor annual effective doses ranged from 1.68 up to similar to 2.82mSv considerably higher than the recommended 1-mSv dose limit for members of the general public. The beach placers at the study locations are dominated by TiO2, Fe2O3, and SiO2. Ir and Hf were found to be incorporated in Zr and Al compounds, respectively, and the anti-correlation of Zr with either Al or Hf indicates that Zr replaces both elements in the beach placers' grains. The radionuclides in beach placers seem to be attributed to Mg-, Ca-, Si-, and Zr-bearing minerals and not associated with Fe-bearing minerals. The heaviest fractions are mainly composed of TiO2, Fe2O3, and ZrO2. The TiO2-bearing minerals in the heaviest fractions contain V-rich portions.
机译：在As-Sufal地区的Hadhramout海岸线上堆积的沙滩砂岩，已被首次探查并分析了它们的放射成因和化学特征。使用56％HPGe检测器通过伽马射线光谱法测量了沙滩铺垫料样品中Ra-226，Th-232和K-40的活性浓度，发现其为1270 +/- 237、2098 +/- 380 ，分别为208 +/- 40 Bq kg（-1）。结果将As-Sufal确定为高自然本底辐射区域。危险指数预测了当将来自该地区的沙滩砂子弄脏的沙子用作建筑材料时，居民外部暴露的升高。沙滩砂子的镭当量是为安全使用材料建造房屋而建议的最高含量的8.6-14.3倍。户外年度有效剂量从1.68到2.82mSv不等，大大高于普通市民建议的1-mSv剂量上限。研究地点的海滩砂矿以TiO2，Fe2O3和SiO2为主。发现Ir和Hf分别掺入Zr和Al化合物中，并且Zr与Al或Hf的反相关性表明Zr替代了沙滩砂粒中的两种元素。海滩砂矿中的放射性核素似乎归因于含Mg，Ca，Si和Zr的矿物，而不与含Fe的矿物相关。最重的部分主要由TiO2，Fe2O3和ZrO2组成。在最重的馏分中，含TiO2的矿物含有富V的部分。

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