Relevance of radon progeny measurements for the assessment of inhalation doses in groundwater utilities

IF 1.4 4区 环境科学与生态学 Q4 ENVIRONMENTAL SCIENCES
Jukka T Tyrväinen, Jonne Naarala and Tuukka Turtiainen
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引用次数: 0

Abstract

The high radon concentrations measured in the indoor air of groundwater facilities and the prevalence of the problem have been known for several years. Unlike in other workplaces, in groundwater plants, radon is released into the air from the water treatment processes. During the measurements of this study, the average radon concentrations varied from 500 to 8800 Bq m–3. In addition, the indoor air of the treatment plants is filtered and there are no significant internal aerosol sources. However, only a few published studies on groundwater plants have investigated the properties of the radon progeny aerosol, such as the equilibrium factor (F) or the size distribution of the aerosol, which are important for assessing the dose received by workers. Moreover, the International Commission on Radiological Protection has not provided generic aerosol parameter values for dose assessment in groundwater treatment facilities. In this study, radon and radon progeny measurements were carried out at three groundwater plants. The results indicate surprisingly high unattached fractions (fp = 0.27–0.58), suggesting a low aerosol concentration in indoor air. The corresponding F values were 0.09–0.42, well below those measured in previous studies. Based on a comparison of the effective dose rate calculations, either the determination of the fp or, with certain limitations, the measurement of radon is recommended. Dose rate calculation based on the potential alpha energy concentration alone proved unreliable.
氡子体测量与地下水设施吸入剂量评估的相关性
地下水设施室内空气中测得的氡浓度很高,这个问题的普遍性几年前就已为人所知。与其他工作场所不同,地下水厂的氡是从水处理过程中释放到空气中的。在这项研究的测量过程中,氡的平均浓度从 500 到 8800 Bq m-3 不等。此外,处理厂的室内空气经过过滤,没有明显的内部气溶胶源。然而,只有少数已发表的关于地下水厂的研究调查了氡后代气溶胶的特性,如平衡因子(F)或气溶胶的大小分布,这对评估工人受到的剂量非常重要。此外,国际辐射防护委员会也没有提供用于地下水处理设施剂量评估的通用气溶胶参数值。本研究在三家地下水厂进行了氡和氡后代的测量。结果表明,未附着分数出奇地高(fp = 0.27-0.58),表明室内空气中的气溶胶浓度较低。相应的 F 值为 0.09-0.42,远低于以往研究中测得的数值。根据对有效剂量率计算结果的比较,建议测定 fp 或在一定限制条件下测量氡。事实证明,仅根据潜在α能量浓度计算剂量率是不可靠的。
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
Journal of Radiological Protection
Journal of Radiological Protection 环境科学-公共卫生、环境卫生与职业卫生
CiteScore
2.60
自引率
26.70%
发文量
137
审稿时长
18-36 weeks
期刊介绍: Journal of Radiological Protection publishes articles on all aspects of radiological protection, including non-ionising as well as ionising radiations. Fields of interest range from research, development and theory to operational matters, education and training. The very wide spectrum of its topics includes: dosimetry, instrument development, specialized measuring techniques, epidemiology, biological effects (in vivo and in vitro) and risk and environmental impact assessments. The journal encourages publication of data and code as well as results.
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