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Radon in the dry carbon dioxide spa of Mátraderecske, Hungary

Sóki E., Csige I.

Nukleonika

2016

Vol. 61, No. 3

245--249

The final product of a post-volcanic activity is the exhalation of low-temperature (<100°C) gases containing mostly carbon dioxide. The phenomenon is called mofettes, which are often used for therapeutic treatments in the form of dry CO2 spas. Along its pathway to the surface, the deep origin gas also intakes different radon isotopes from the rocks and soils; therefore, the risks associated with radon exposures should also be a concern. In this work, we have found that the 222Rn activity concentration in the mofette gas of Mátraderecske is particularly high; it is in the order of 200 kBq•m–3. However, owing to the carefully designed flow pattern of mofette gas and fresh air, the radon level is about 1 kBq∙m–3 at the breath level of the staff, accompanying the treatment, which is the radon reference level for workers in Hungary. We have also found that in this dry spa, radon is a good tracer of CO2; therefore, it can be used to monitor the CO2 distribution in the treatment pools.

Mofeta ze Złockiego (Beskid Sądecki) atrakcją geologiczną

Rajchel L., Rajchel J.

Przegląd Geologiczny

2006

Vol. 54, nr 12

1089-1092

Themost beautiful Polish mofette occurs in the Sądecki (Sącz) Beskid, within the Krynica tectonic-facial zone of the Magura Unit (Inner Carpathians). It is located in the Złocki Stream upstream of the Złockie village in the Muszyna commune. The occurrence has numerous exhalations of CO2 in the valley floor and on the sides of this boggy stream as well as in the „Zatopione” and „Bulgotka” springs. It is also the site of the dry exhalation „Dychawka”. The floor of the valley is covered with gelatinous rusty-brown deposits of iron oxyhydroxides that precipitate either due to chemical or organic processes (the latter initiated by numerous microorganisms, mainly ferruginous bacteria). The site is legally protected as the Professor Henryk Świdziński monument of inanimate nature. In September 2005 it was made accessible for tourists and currently is an important geological attraction in the Popradzki Landscape Park.