Hellenic Centre for Marine Research, Institute of Oceanography, 19013, Anavyssos, Attica, Greece.
University of Aegean, Department of Marine Sciences, 81100, Mytilene, Lesvos island, Greece.
J Environ Radioact. 2021 Jul;233:106583. doi: 10.1016/j.jenvrad.2021.106583. Epub 2021 Mar 21.
A medium resolution underwater gamma ray spectrometer was deployed in the submarine groundwater spring of Anavalos and was combined with conductivity and temperature sensors for continuous measurements of natural radioactivity, salinity and water temperature, respectively. The activity concentrations of radon progenies varied from (5-40) kBq m, exhibited reverse dependence with salinity and were found above the guideline proposed by Environmental Protection Agency (11 kBq m). Their ratio was above unity indicating radon gas escape to the atmosphere. Time-series of the activity concentration together with their ratios were provided enabling the system configuration for long term monitoring applications. The in-situ method proved to be an effective tool to study the radioactivity levels of the spring and the groundwater - seawater interaction process. Furthermore, the proposed tool provides cost-effective measurements in terms of real-time and long-term requirements and, it is characterized by flexibility in terms of sensor integration in different platforms to perform submarine groundwater studies in a temporal and spatial manner.
在阿纳瓦洛斯的海底地下水泉部署了中等分辨率水下伽马射线光谱仪，并结合电导率和温度传感器，分别对天然放射性、盐度和水温进行连续测量。氡子体的活度浓度变化范围为（5-40）kBq m，与盐度呈反相关，且高于环境保护局（EPA）提出的（11 kBq m）指导值。它们的比值大于 1，表明氡气逸入大气。提供了活度浓度及其比值的时间序列，使系统能够进行长期监测应用的配置。现场方法被证明是研究泉水放射性水平和地下水-海水相互作用过程的有效工具。此外，该工具在实时和长期要求方面提供了具有成本效益的测量，并且在不同平台上集成传感器方面具有灵活性，可在时间和空间上对海底地下水进行研究。
