서울지역 먹는물공동시설의 자연방사성물질 분포 특성

( Distribution Characteristics of Natural Radioactive Materials

in Spring water of Seoul )

이지영* · 윤종철 · 조혜윤 · 김예슬 · 이목영

서울시보건환경연구원 물환경연구부 먹는물분석팀

*Corresponding author: younga73@seoul.go.kr

Abstract

Concentrations of uranium(U), and radon(Rn) were measured in  195 spring waters in  Seoul  with the aim of determining the range and distribution of concentrations in the area. U concentrations ranged from 0.01 to 46.9 ㎍/L and Rn concentrations ranged from 35 to 46,152 pCi/L. U concentrations in 1.5% of the samples exceeded 30 ㎍/L, which is the Drinking water standards. Rn concentrations in 14.8% and 6.1% of the samples exceeded 4,000 pCi/L(the Alternative Maximum Contaminant Level (AMCL) of the US EPA) and 8,100 pCi/L(Finland’s guideline level) respectively. The average U and Rn concentrations in spring waters hosted by granite rocks was higher than that in spring waters hosted by metamorphic rocks. And we found that U and Rn concentrations were influenced by geology. U and Rn showed weakly positive correlation. pH, EC, Ca, K, Na, Si, F and Cl had positive correlations with uranium. Only F had positive correlation with Rn. pH, EC, Ca, K, Mg, SO4 and Cl had negative correlation with Rn. NO3-N had no correlation with U and Rn. In this study average concentration of radionuclides in spring water wasn’t too high, but needed to control the concentration of them to prevent exposure to the people.

Key words : Spring water, Uranium, Radon, Radionuclides, Granite