대전지역 대기부유진, 낙진 및 강수 중 $^7Be$ 및 $^{137}Cs$ 방사능 농도의 계절별 변화
김창규;이승찬;이동명;노병환;
Seasonal Variation of $^7Be$ and $^{137}Cs$ Concentrations in Airborne Dust, Dry Fallout and Precipitation in Daejeon
Kim, Chang-Kyu;Lee, Seung-Chan;Lee, Dong-Myung;Rho, Byung-Hwan;
ABSTRACT
The seasonal variation of $^7Be$ and $^{137}Cs$ concentrations in airborne dust, precipitation and dry fallout collected at Daejeon during the period of 1998 - 1999 has been studied. The annual mean values of 7Be concentrations in airborne dust, precipitation and dry fallout were in the range of $3.80{sim}4.29;mBq;m^{-3},;1.25{sim}1.67;Bq;l^{-1},;19.7{sim}22.3 MBq;km^{-2}$, respectively. The annual mean values of $^{137}Cs$ concentrations in airborne dust, precipitation and dry fallout ranged $1.08{sim}1.28{mu}Bq;m^{-3},;0.44{sim}2.66 mBq;l^{-1};;0.036{sim}0.0455;MBq;km^{-2}$, respectively. While the concentrations of $^7Be$ and $^{137}Cs$ in airborne dust and dry fallout were relatively higher in the spring and autumn when the amount of dry fallout increased than in other season, their concentrations in precipitation were relatively lower in the summer when the rainfall increased. The total depositions of $^7Be$ and $^{137}Cs$ due to dry fallout and precipitation were in the range of $80.7{sim}137MBq;km^{-2}$ and $0.059{sim}0.060MBq;km^{-2}$, respectively. More than 80% of $^7Be$ deposition resulted from precipitation, whereas about 60% of $^{137}Cs$ deposition was due to dry fallout.
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