Econ. Environ. Geol. 2012; 45(3): 277-294

Published online June 30, 2012

© THE KOREAN SOCIETY OF ECONOMIC AND ENVIRONMENTAL GEOLOGY

Characteristics of Radon Variability in Soils at Busan Area

Jin-seop Kim, Sunwoong Kim, Hyomin Lee*, Jeongyun Choi and Ki-Hoon Moon

Department of Geological Sciences, Pusan National University

Correspondence to :

Hyomin Lee

hmlee61@pusan.ac.kr

Received: April 12, 2012; Accepted: June 18, 2012

Abstract

The characteristics of temporal·spacial radon variation in soil according to parent rock type and affecting factors were studied in Busan, Korea. The concentration of 222Rn in soils and their parent elements (226Ra,228Ra, U and Th) in rocks and soils were measured at 24 sites in Busan area. The distribution and transportation behavior of these parent elements were analyzed and their correlations to radon concentration in soil were determined. Topographic effects were also evaluated. Two in-situ radon measurement (soil probe and buried tube) methods were applied to measure radon concentration in soil and their accuracies were evaluated. The spatial variation of radon in soil generally reflected U concentration in the parent rock. Average radon concentrations were higher in plutonic rocks than in volcanic rocks and were decreased in the order of felsic>intermediate>mafic rock. However, the radon concentrations were significantly varied in soils developed from same parent rocks due to the disequilibrium of U and 226Ra between rock and soil. As results, the correlation of these element concentrations between rocks and soils was very low and radon concentrations in soils had highly co-related to the concentrations of these elements in soils. Th and 228Ra show complex enrichment characteristics, differing significantly with U, in soils developed from same parent rock because the geochemical behavior of these elements during weathering and soil developing process was different with U. The radon concentrations in the same depth of soil in slope area were also different according to positions. The radon concentrations in soils developed from same parent rocks (19 sites at Pusan National University) varied 6.8~29.8Bq/L range because of small scale topographic variation. The opposite seasonal variation pattern of radon were observed according to soil properties. It was determined that buried tube method is more accurate method than soil probe method and was very advantageous application for the analysis for the characteristics of temporal·spacial radon variation in soil.

Keywords radon, radium, uranium, radioactivity, soil

Article

Econ. Environ. Geol. 2012; 45(3): 277-294

Published online June 30, 2012

Copyright © THE KOREAN SOCIETY OF ECONOMIC AND ENVIRONMENTAL GEOLOGY.

Characteristics of Radon Variability in Soils at Busan Area

Jin-seop Kim, Sunwoong Kim, Hyomin Lee*, Jeongyun Choi and Ki-Hoon Moon

Department of Geological Sciences, Pusan National University

Correspondence to:

Hyomin Lee

hmlee61@pusan.ac.kr

Received: April 12, 2012; Accepted: June 18, 2012

Abstract

The characteristics of temporal·spacial radon variation in soil according to parent rock type and affecting factors were studied in Busan, Korea. The concentration of 222Rn in soils and their parent elements (226Ra,228Ra, U and Th) in rocks and soils were measured at 24 sites in Busan area. The distribution and transportation behavior of these parent elements were analyzed and their correlations to radon concentration in soil were determined. Topographic effects were also evaluated. Two in-situ radon measurement (soil probe and buried tube) methods were applied to measure radon concentration in soil and their accuracies were evaluated. The spatial variation of radon in soil generally reflected U concentration in the parent rock. Average radon concentrations were higher in plutonic rocks than in volcanic rocks and were decreased in the order of felsic>intermediate>mafic rock. However, the radon concentrations were significantly varied in soils developed from same parent rocks due to the disequilibrium of U and 226Ra between rock and soil. As results, the correlation of these element concentrations between rocks and soils was very low and radon concentrations in soils had highly co-related to the concentrations of these elements in soils. Th and 228Ra show complex enrichment characteristics, differing significantly with U, in soils developed from same parent rock because the geochemical behavior of these elements during weathering and soil developing process was different with U. The radon concentrations in the same depth of soil in slope area were also different according to positions. The radon concentrations in soils developed from same parent rocks (19 sites at Pusan National University) varied 6.8~29.8Bq/L range because of small scale topographic variation. The opposite seasonal variation pattern of radon were observed according to soil properties. It was determined that buried tube method is more accurate method than soil probe method and was very advantageous application for the analysis for the characteristics of temporal·spacial radon variation in soil.

Keywords radon, radium, uranium, radioactivity, soil

    KSEEG
    Apr 30, 2024 Vol.57 No.2, pp. 107~280

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