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The paper deals with a methodology proposed for measuring the concentration of air ions in the environment of speleotherapeutic caves, and with the implementation of the AK-UTEE-v2 ionmeter. Speleotherapy, in the context of its general definition, is the medical therapy that utilizes the climate of selected caves to treat patients with health problems such as asthma. These spaces are characterized by the presence of high air humidity and they make extreme demands on the execution of the measuring device, the Gerdien tube (GT in the following) in particular, and on the amplifier electronics. The result is an automated measuring system using a GT with low-volume air flow, enabling long-term measuring of air ion concentration and determination of spectral ion characteristics. Interesting from the instrumentation viewpoint are the GT design, active shielding, and execution of the electrometric amplifier. A specific method for the calculation of spectral ion characteristics and the mode of automatic calibration were proposed and a procedure of automatic measurement in the absence of attendants was set up. The measuring system is designed for studying and long-term monitoring of the concentration of light negative ions in dependence on climatic conditions and on the mobility of ions occurring in the cave.

. Nagy K. Kovács T. 2007 Contribution of 222 Rn, 226 Ra, 234 U and 238 U radionuclides to the occupational and patient exposure in Heviz-spas in Hungary J. Radioanal. Nucl. Chem. 272 101 106 10.1007/s10967-006-6837-9 9. Nagy, K., Kávási, N., Kovács, T., & Somlai, J. (2008). Radon therapy and speleotherapy in Hungary. La Presse Thermale et Climatiqua , 145 , 219–225. Nagy K. Kávási N. Kovács T. Somlai J. 2008 Radon therapy and speleotherapy in Hungary La Presse Thermale et Climatiqua 145 219 225 10. Talha, S. A., de Meijer, R. J., Lindsay, R., Newman, R. T