Abstract
Abstract. Measurements have been made of 222Rn release from diverse soils in the region surrounding Málaga, Spain. These flux measurements were carried out by two methods. A direct method using a static chamber technique and another indirect method obtained from concentration profile measurements of 222Rn in the soil air. The effects of meteorological variables and other parameters on 222Rn flux were studied. The factors that most affected the instantaneous value of 222Rn release were humidity and soil thermal gradient. The directly measured 222Rn fluxes at investigated sites are higher than 222Rn fluxes derived by the indirect method.
Highlights
Rn is an inert radioactive element with a half-life of 3.8 days
4.2.2 Ra release and soil thermic gradient We have found a correlation between Rn release and thermal gradient for soil temperature between 15 and 80 cm deep for soils M1 and M2
The flux evaluated by indirect method has been obtained by supposing that the transport of Rn in the soil air is controlled by molecular diffusion
Summary
Rn is an inert radioactive element with a half-life of 3.8 days. It belongs to the radioactive uranium series and occurs in soil gas in varying concentrations. Rn has been used in more quantitative studies to determine vertical matter diffusion coefficients (Druilhet and Fontan, 1972; Hsu et al, 1980). Another interesting use of Rn is as an indicator of the vertical stability of the lower atmosphere at a given site through a study of the equivalent mixing height, a parameter which is a characteristic of vertical stability (Guedalia et al, 1980). The Rn release measured by accumulation method is compared for each soil with the exhalation obtained indirectly from concentration profile measurements in the soil air
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