Outline of natural radon occurrences on karstic terrains of Hungary.

Hakl, J; Hunyadi, I; Csige, I; Geczy, G; et al.

Inst. Nucl. Res., H-4001 Debrecen, POB 51, Hungary

Conference: 5. Int. Symp. on the Natural Radiation Environment, Salzburg (Austria), 22-28 Sep 1991 Editor Janssens, A; Lowder, W; Olast, M; Sinnaeve, J; Steinhaeusler, F (eds)

THE NATURAL RADIATION ENVIRONMENT., NUCLEAR TECHNOLOGY PUBLISHING, ASHFORD, KENT (UK), 1992, pp. 183-186, Radiation Protection Dosimetry [RADIAT. PROT. DOSIMET.], vol. 45, no. 1-4 suppl. ISSN 0144-8420 - NUCLEAR TECHNOLOGY PUBLISHING, ASHFORD, KENT (UK)

Starting from 1978 continuous radon observation was performed at about 150 sub- and near-surface monitoring stations in different substances (cave air, soil, water) of Hungarian karstic regions. The radon activity concentration was registered by nuclear track detectors (changed every month) using diffusion cups. The mean values of the time series obtained fall in the range of 0.2-14 kBq multiplied by m super(-3). In cave air typically summer maxima and winter minima were observed: their ratios fall in the range of 10-100. The soil gas measurements performed above a cave showed maxima in winter and minima in summer. In a few cases the radon content of waters was strongly related to the yield of the feeding stream.