[논문]Measurement and Spatial Analysis of Uranium-238 and Radon-222 of Soil in Seoul

Oh, Dal-Young; Shin, Kyu-Jin; Jeon, Jae-Sik

doi:10.7857/jsge.2017.22.1.033

Measurement and Spatial Analysis of Uranium-238 and Radon-222 of Soil in Seoul 원문보기

지하수토양환경 = Journal of soil and groundwater environment, v.22 no.1, 2017년, pp.33 - 40

Oh, Dal-Young (Seoul Metropolitan Government Research Institute of Public Health and Environment) , Shin, Kyu-Jin (Seoul Metropolitan Government Research Institute of Public Health and Environment) , Jeon, Jae-Sik (Seoul Metropolitan Government Research Institute of Public Health and Environment)

Abstract ▼ AI-Helper

Identification of radon in soil provides information on the areas at risk for high radon exposure. In this study, we measured uranium-238 and radon-222 concentrations in soil to assess their approximate levels in Seoul. A total of 246 soil samples were taken to analyze uranium with ICP-MS, and 120 measurements of radon in soil were conducted with an in-situ radon detector, Rad7 at a depth of 1-1.5 m. The data were statistically analyzed and mapped, layered with geological classification. The range of uranium in soil was from 0.0 to 8.5 mg/kg with a mean value of 2.2 mg/kg, and the range of radon in soil was from 1,887 to $87,320Bq/m^3$ with a mean value of $18,271Bq/m^3$. The geology had a distinctive relationship to the uranium and radon levels in soil, with the uranium and radon concentrations in soils overlying granite more than double those of soils overlying metamorphic rocks.

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제안 방법

In this study, uranium concentrations were pre-measured in order to predict the areas with a high risk for radon, and then radon concentrations in soil were spatially measured and analyzed. The uranium map and the radon map with geological classification were made using Arcview 3.

대상 데이터

2 m. The data were achieved from the Borehole Status in Seoul in Geotechnical Information Database System (http://surveycp.seoul.go.kr) and the distance between a borehole and sampling spot is within 50 m. From the acquired data, the compositions of the soils are shown in Table 2 and almost of them consist of gravel, sand, or sandy silts, therefore the permeability of each soil is expected to be quite high with no such a meaningful difference.
2 using a format corresponding to a map. The map was made using Arcview3.3, and the geological base layer files (shp, dbf, shx, etc.) were provided by the Seoul Development Institute and KIGAM (Korea Institute of Geoscience and Mineral Resources). And basement rock in each sampling spot was double-checked on the 1 : 250,000 geographical map provided on-line by KIGAM (https://mgeo.
Although radon in soil as a representative value has been generally measured using grid methods through which the area is divided at some intervals as 1 sample per 100 × 100 meter squares or 1 × 1 kilometer squares in European radon soil maps (Dubois, 2005), boring in privately-owned lands requires adequate administrative procedures to gain permission in advance. Therefore, the sampling sites of this study were selected from about 350 Annual Soil Contamination Monitoring sites that were previously legally appointed. Instead, the sites were randomly selected, and these also covered the entire area of study at some intervals.

성능/효과

1996). In this study, although we could not set the moisture content of the samples identically because measuring was done in situ, the moisture content of soil was 3-25%, with an average of 13% and standard deviation of 5%, which is no drastic difference between them.

후속연구

The radon distribution showed a similar tendency to the geology like the uranium did, which is that a high concentration of radon generally occurred in soil overlying granite bedrock. The average radon concentration in soil for which the bedrock consists of granite was of 27,415 Bq/m³, and it is over twice as high as that of metamorphic bedrock at 11,512 Bq/m³, so a more cautious investigation over the granite area is required in the future. In addition, for the alluvium area, the underlying bedrock was thought to dominate the soil radon concentration because the average radon concentration in those areas with granite bedrock is also over twice as bigger than the one with non-granite bedrock.
, which is relatively easy to measure can be a better alternative. Therefore the radon potential model using specific statistical techniques as a form of principal component analysis and GIS technique is planned to be developed, and the measured concentrations in this study can be used to verify the model for further study.

참고문헌 (40)

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