尼日利亚西南部三个连续地质构造的住宅和工作场所的室内氡和钍。

IF 1.5 4区 环境科学与生态学 Q3 BIOLOGY
O O Awe, I C Okeyode, A O Abayomi-Alli, A O Mustapha, Chutima Kranrod, Yasutaka Omori, Masahiro Hosoda, Shinji Tokonami
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引用次数: 0

摘要

利用被动式氡-钍鉴别探测器RADUET,在尼日利亚西南部组织了第一次室内氡和钍同步测量的区域调查。这些测量是在尼日利亚西南部盆地内三个地质构造的各种住宅和工作场所进行的,其中包括Akoka(拉各斯州)的近期沉积物,Ilishan(奥贡州)的白垩纪沉积物(Abeokuta地层)和Alabata(奥贡州Abeokuta)的地下室。193个站点的氡和钍浓度均呈对数正态分布,氡的浓度分别为(p -3和24±21 Bq m-3,钍的浓度分别为2-709 Bq m-3和94±124 Bq m-3。方差分析结果显示,不同下伏地质条件下氡、钍浓度存在显著差异,其中伊利山(白垩纪沉积)氡浓度显著(p -3),但均低于300 Bq m-3的作用水平。这项研究表明,在氡浓度较高的情况下,在室内氡测量中不应忽视其贡献,特别是在具有古老沉积和基底复杂地质的地区。应当指出,需要进行剂量评估,以量化这三个地点的氡和钍对人体暴露的相对贡献。同时,应鼓励研究区域内建筑物的居住者优化室内通风。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Indoor radon and thoron in dwellings and workplaces across three contiguous geological formations in Southwest Nigeria.

The first regional survey of concurrent indoor radon and thoron measurements in Southwestern Nigeria was organized using the passive radon-thoron discriminative detectors RADUET. The measurements were carried out in various dwellings and workplaces across three geological formations within the Southwestern Nigeria basin, which consists of recent sediments in Akoka (Lagos State), cretaceous sediments known as Abeokuta formation in Ilishan (Ogun State), and basements in Alabata (Abeokuta, Ogun State). Both radon and thoron concentrations at 193 sites showed log-normal distributions, with significantly (p < 0.05) higher values of thoron than radon concentrations and a weak correlation (R = 0.224) between the two. The ranges and arithmetic means of the concentrations were 6-132 Bq m-3and 24 ± 21 Bq m-3 for radon and 2-709 Bq m-3 and 94 ± 124 Bq m-3 for thoron, respectively. ANOVA results showed significant variations in radon and thoron concentrations according to the underlying geology, with radon concentrations in Ilishan (cretaceous sedimentary) significantly (p < 0.05) higher than those of Akoka (recent sedimentary) and Alabata (basement complex). No significant differences (p = 0.09) were found between thoron concentrations in Alabata and Ilishan, and both locations had significantly higher (p < 0.05) concentrations of thoron than those recorded in Akoka. A test of the influence of building types showed that radon and thoron concentrations in offices were significantly (p < 0.05) lower than those in homes. None of the thoron concentrations were zero, and almost all were higher than the corresponding radon concentrations. Some of the radon concentrations exceeded the recommended reference level of 100 Bq m-3, but all were below the action level of 300 Bq m-3. This study has shown that with high concentrations of thoron, its contributions should not be neglected in indoor radon measurements, particularly in the areas with old sedimentary and basement complex geology. It is noted that dose evaluation is required to quantify the relative contributions of radon and thoron to human exposures in the three locations. Meanwhile, occupants of buildings in the study areas should be encouraged to optimize indoor ventilation.

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来源期刊
CiteScore
4.00
自引率
5.90%
发文量
53
审稿时长
>36 weeks
期刊介绍: This journal is devoted to fundamental and applied issues in radiation research and biophysics. The topics may include: Biophysics of ionizing radiation: radiation physics and chemistry, radiation dosimetry, radiobiology, radioecology, biophysical foundations of medical applications of radiation, and radiation protection. Biological effects of radiation: experimental or theoretical work on molecular or cellular effects; relevance of biological effects for risk assessment; biological effects of medical applications of radiation; relevance of radiation for biosphere and in space; modelling of ecosystems; modelling of transport processes of substances in biotic systems. Risk assessment: epidemiological studies of cancer and non-cancer effects; quantification of risk including exposures to radiation and confounding factors Contributions to these topics may include theoretical-mathematical and experimental material, as well as description of new techniques relevant for the study of these issues. They can range from complex radiobiological phenomena to issues in health physics and environmental protection.
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