尼日利亚国产瓷砖和中国进口瓷砖天然放射性比活度的比较分析。
Comparative Analysis of Natural Radioactivity Content in Tiles made in Nigeria and Imported Tiles from China.
机构信息
Department of Physics, Covenant University Ota, Ota, Nigeria.
Department of Chemistry, Covenant University Ota, Ota, Nigeria.
出版信息
Sci Rep. 2018 Jan 30;8(1):1842. doi: 10.1038/s41598-018-20309-0.
In this investigation, natural radioactive contents in tiles manufactured in Nigeria and tiles imported from China were measured using gamma ray spectroscopy. High Purity Germanium detector was used to estimate the concentrations of some radioisotopes present in 17 samples of various tiles from Nigeria and China. The average activity concentrations of Ra, Th, and K for the tiles were found to be 68.2 ± 0.5; 173.9 ± 9.2 and 490 ± 15 Bq/kg and 58.2 ± 0.5, 161.5 ± 9.4 and 455.7 ± 15.1 Bq/kg for the tiles from Nigeria and China respectively. Radiological hazard indices such as absorbed dose rate, radium equivalent activity, external Hazard Index (H), internal Hazard Index (H), Annual Effective Dose (mSv/y), Gamma activity Index (Iγ) and Alpha Index (Iα) were determined for both kind of tiles from Nigeria and China. The mean values obtained were: 354.56 and 317.16 Bq/kg; 169.22 nGyh and 153.92 nGyh; 0.95 and 0.87; 1.14 and 1.08; 1.59 mSv/y and 1.52 mSv/y; 1 and 1.15 and; 0.34 and 0.29 respectively. The mean value of radium equivalent obtained in this study is less than that of the international reference value of 370 Bq/kg for the both kind of tiles.
本研究采用伽马能谱法测定了尼日利亚国产瓷砖和中国进口瓷砖中的天然放射性核素含量。使用高纯锗探测器估算了来自尼日利亚和中国的 17 种不同类型瓷砖中存在的一些放射性同位素的浓度。结果表明，这些瓷砖的 Ra、Th 和 K 的平均活度浓度分别为 68.2±0.5、173.9±9.2 和 490±15 Bq/kg 和 58.2±0.5、161.5±9.4 和 455.7±15.1 Bq/kg。同时，还测定了来自尼日利亚和中国的两种类型瓷砖的辐射危害指数，如吸收剂量率、镭当量活度、外照射指数（H）、内照射指数（H）、年有效剂量（mSv/y）、伽马活度指数（Iγ）和阿尔法活度指数（Iα）。获得的平均值分别为：354.56 和 317.16 Bq/kg；169.22 nGyh 和 153.92 nGyh；0.95 和 0.87；1.14 和 1.08；1.59 mSv/y 和 1.52 mSv/y；1 和 1.15；0.34 和 0.29。本研究中获得的镭当量平均值小于两种类型瓷砖的国际参考值 370 Bq/kg。
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