Radioactive springs in Prague-Čimice

Q4 Earth and Planetary Sciences Geoscience Research Reports Pub Date : 2022-05-04 DOI:10.3140/zpravy.geol.2022.04

Antonín Lustik, V. Goliáš, Petr Cupal, J. Bruthans, Jan Schröfel, V. Kachlík, Lenka Jílková, M. Mihaljevič

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Abstract

Groundwater inflows showing notable natural radioactivity have been found at the northern end of the Holešovice cable tunnel close to the Čimice Grove. This groundwater originates from the Barrandian Neoproterozoic slates of the Blovice accretionary complex, Belt I (Šárka-Zbiroh Belt) at depths approximately 100 meters below the surface, occurring along 50 meter profile of the cable tunnel. Water springs are dispersed in the spring area, with the total discharge of 2 L/s. Groundwater is cold (T ~ 11.1 – 12.3 °C), neutral (pH ~ 6 – 7.48), suboxic to oxic (Eh (ORPH) ~ 177 up to 418 mV), of a hydrochemical type Ca-Mg-HCO3, total mineralization being around 702 mg/L. Radon activity (222Rn) varies between 415 and 1195 Bq/L and radium activity (226Ra) ranges between 0.18 and 5.3 Bq/L. Activities of Rn and Ra are relatively high. Currently, this is the most radioactive water within Prague agglomeration. This water is relatively aggressive as well, causing damage to the concrete lining of the cable tunnel and also allowing formation of calcite precipitates with an increased radium (226Ra) activity.

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布拉格的放射性泉水-Čimice

在靠近Čimice格罗夫的Holešovice电缆隧道北端，发现流入的地下水显示出明显的天然放射性。该地下水来源于布洛维兹(Blovice)增生杂岩带I (Šárka-Zbiroh Belt)的Barrandian新元古代板岩，深度约为地表以下100米，沿电缆隧道50米剖面出现。泉水分散在泉水区，总流量为2l /s。地下水为低温(温度11.1 ~ 12.3℃)、中性(pH ~ 6 ~ 7.48)、亚氧-氧(Eh (ORPH) ~ 177 ~ 418 mV)，水化学类型为Ca-Mg-HCO3，总矿化约702 mg/L。氡活度(222Rn)介于415至1195 Bq/L之间，镭活度(226Ra)介于0.18至5.3 Bq/L之间。Rn和Ra的活性相对较高。目前，这是布拉格地区放射性最强的水。这种水也具有相对的侵略性，会对电缆隧道的混凝土衬里造成损害，并使方解石沉淀的形成具有增加的镭(226Ra)活性。

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Geoscience Research Reports Earth and Planetary Sciences-Stratigraphy

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0.30

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期刊介绍： Geoscience Research Reports inform the general public about current state of knowledge in a wide variety of geologic subjects. Here the reader will find the results of research conducted by the academia, by the public as well as private sectors. The articles are distributed into individual science topics – regional geology, stratigraphy, Quaternary research, engineering geology, paleontology, mineralogy, petrology, geochemistry, hydrogeology, mineral resources, geophysics, geological information system and international activities.