Bree、Klein-Brak、Bakens和uMngeni河沉积物中天然放射性核素活性浓度及其相关辐射危害指数

Q2 Agricultural and Biological Sciences

Transactions of The Royal Society of South Africa Pub Date : 2020-09-01 DOI:10.1080/0035919X.2020.1815894

A. O. Ilori, N. Chetty, B. Adeleye

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引用次数: 3

摘要

采用超纯锗(HPGe)检测仪测定了南非河流沉积物样品中的锗活度浓度，并对其放射性危害指数进行了评价。研究结果表明:富油区沉积物样品中226Ra、232Th和40K的平均活度浓度分别为11.13、7.57和22.5;布里河、克莱恩-布拉克河和巴肯斯河分别为5.51、4.62、125.02和7.60、5.32、24.12。226Ra、232Th和40K的对照点(UMngeni River)值分别为4.13、3.28和13.04。Bree河、Klein-Brak河、Bakens河和uMngeni河沉积物样本的平均超额终生癌症风险分别为0.394、0.393、0.277和0.163。所有得到的数值都表明富油区和非富油区河流样品中的天然放射性核素浓度存在显著差异。报告的放射性浓度和放射性危害指数低于世界平均值;因此，在所有研究区域，辐射健康危害的风险可以忽略不计。

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Activity concentration of natural radionuclides in sediments of Bree, Klein-Brak, Bakens, and uMngeni rivers and their associated radiation hazard indices

A hyper-pure germanium (HPGe) detector was used to measure the activity concentrations in sediment samples of rivers in South Africa, and the associated radiological hazard indices were evaluated. The results of the study indicated that the mean activity concentrations of 226Ra, 232Th and 40K in the sediment samples from the oil-rich areas are 11.13, 7.57, 22.5 ; 5.51, 4.62, 125.02 and 7.60, 5.32, 24.12 for the Bree, Klein-Brak and Bakens Rivers, respectively. In contrast, the control site (UMngeni River) values were 4.13, 3.28, and 13.04 for 226Ra, 232Th, and 40K. The average excess lifetime cancer risks are 0.394 × , 0.393 × , 0.277 × and 0.163 × for sediment samples at Bree, Klein-Brak, Bakens, and uMngeni rivers. All obtained values indicated a significant difference between the natural radionuclide concentrations in the samples from the rivers in oil-rich areas compared to those of the non-oil-rich area. The values reported for the activity concentrations and radiological hazard indices were below the average world values; hence, the risk of radiation health hazard was negligible in all study areas.

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来源期刊

Transactions of The Royal Society of South Africa Agricultural and Biological Sciences-Agricultural and Biological Sciences (all)

CiteScore

2.80

自引率

0.00%

发文量

期刊介绍： Transactions of the Royal Society of South Africa , published on behalf of the Royal Society of South Africa since 1908, comprises a rich archive of original scientific research in and beyond South Africa. Since 1878, when it was founded as Transactions of the South African Philosophical Society, the Journal’s strength has lain in its multi- and inter-disciplinary orientation, which is aimed at ‘promoting the improvement and diffusion of science in all its branches’ (original Charter). Today this includes natural, physical, medical, environmental and earth sciences as well as any other topic that may be of interest or importance to the people of Africa. Transactions publishes original research papers, review articles, special issues, feature articles, festschriften and book reviews. While coverage emphasizes southern Africa, submissions concerning the rest of the continent are encouraged.