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Abstract  

To characterize the future redox milieu caused by natural degradation of wood in flooded mines, the aquifer of a highland bog ground was studied as a natural analogue site. Going from the surface to a depth of one meter in the bog water, the redox potential measured with a platinum electrode changes from 593 mV to −95 mV. From the depth-water analyses and analyses of bog gas extracted from the ground, an Eh value of −119±5 mV could be calculated. Methane and hydrogen sulfide were found in the gas, characterizing the strongly reducing condition in the bog ground. From that, the conclusion for the future mine situation can be drawn that uranium(VI) and arsenic(V) will be reduced and precipitated as U(OH)4 and As2S3. In that way, decontamination of the mine water takes place as a consequence of a natural attenuation process.

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Journal of Radioanalytical and Nuclear Chemistry
Authors: Tadeusz Przylibski, Jakub Bartak, Elżbieta Kochowska, Lidia Fijałkowska-Lichwa, Krzysztof Kozak, and Jadwiga Mazur

Abstract  

The article presents new Polish probes SRDN-3, developed at the Institute of Nuclear Chemistry and Technology in Warsaw, equipped with a semi-conductor detector used for continuous measurements of 222Rn activity concentration. Due to a relatively high lower detection limit, the device is dedicated for use in underground spaces—caves, adits, mines, tourist routes in strongholds, pyramids, etc. Its structure allows for difficult conditions in which the device is transported to the measurement site, as well as hard operating conditions caused chiefly by large ambient relative humidity, reaching up to 100%. The authors present calibration results of these appliances, as well as the results of their work in a cave and an adit in the Sudetes (SW Poland). After almost 2 years of working in difficult conditions, the probes displayed high reliability. No defects of the semi-conductor detectors or the electronics were observed, which ensured problem-free communication of the probe-programmer-PC set. Thanks to this, the authors have a 2 year stock of data, recorded hourly by five probes, at their disposal. The only element that did not withstand the test of extreme operating conditions was one of the combined relative humidity and temperature sensors. No powering problems were observed either, and the batteries were replaced once a year, before the winter season. Also the programmer functioned faultlessly, enabling data transmission to a PC, which, being much more sensitive to operating conditions, had been placed away from the site of probe exposure. After using more sensitive temperature, relative humidity and pressure sensors, SRDN-3 probes will certainly prove an excellent tool for microclimate measurements (including measurement of air-atmosphere exchange) in caves and other underground sites. Even nowadays they are already a satisfactory tool for monitoring 222Rn concentration in underground spaces.

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Abstract  

This work describes a method which was developed to determine the concentration of 222Rn gas and the equilibrium factor F between the concentration of the gas and its progeny by means of a single device that uses two Makrofol passive track detectors. The device is completely passive and time integrated. Conditions make it very appropriate to be used in any atmospheres in which human activity takes place, such as houses, schools, works and underground mines. A series of measurements of 222Rn gas concentration and equilibrium factor F were made in different cities of the Argentine Republic and the corresponding levels of doses were estimated.

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. Cataldi , R. ( 2001 ). Sustainability and renewability of geothermal energy . Proceedings of the International Scientific Conference on Geothermal Energy in Underground Mines, Ustron, Poland, 4. Duan

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. , J.A. Scott , H. Shang 2011 : Geothermal energy recovery from underground mines . – Renewable and Sustainable Energy

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