해양에서 Pb-210 - Po-210 쌍의 겉보기 불균형에서 Bi-210의 역할

Title
해양에서 Pb-210 - Po-210 쌍의 겉보기 불균형에서 Bi-210의 역할
Alternative Title
On the role of 210Bi on the apparent disequilibrium of 210Pb-210Po pair in the sea
Author(s)
김석현; 홍기훈; 김영일
KIOST Author(s)
Kim, Suk Hyun(김석현)KIM, YOUNG-IL(김영일)
Publication Year
2014-06-09
Abstract
The 210Po (t1/2 = 138 days) - 210Pb (t1/2 = 22.3 years) pair as well as that in 238U-234Th pair has been used for estimating export fluxes of particulate organic carbon in the ocean. However, the role of 210Bi has not drawn sufficient attention in the 210Pb-210Po disequilibrium studies although 210Bi as an intermediate decay product of 210Po and substantially long half-life (5.01 days) to participate in the particle processes occurring in the sea, partly due to its short half-life to determine in situ concentration aboard the ship. Most current studies assume that 210Bi is not particle reactive but conservative. However, it is known that 210Bi is more enriched in particulate matter than 210Po and 210Pb as much as an order of magnitude. This indicates that the deficiency of 210Po to 210Pb activities (APbt - APot) in the surface ocean may include the deficiency of 210Bi to 210Pb (APbt - ABit) resulting from sinking of 210Bi attached to the particle in the ocean. We developed a model to elucidate a role of 210Bi in the behavior of 210Po-210Pb pair in the ocean. We assumed that the activities in the dissolved and particulate phases of 210Pb, 210Bi and 210Po in a given water column are determined by the concentration of particle in water column, input and output, distribution coefficients between dissolved and particulate phases, decay constants of these radionuclides. We estimated the 210Bi contribution to the 210Pb-210Ption in the 210Pb-210Po disequilibrium studies although 210Bi as an intermediate decay product of 210Po and substantially long half-life (5.01 days) to participate in the particle processes occurring in the sea, partly due to its short half-life to determine in situ concentration aboard the ship. Most current studies assume that 210Bi is not particle reactive but conservative. However, it is known that 210Bi is more enriched in particulate matter than 210Po and 210Pb as much as an order of magnitude. This indicates that the deficiency of 210Po to 210Pb activities (APbt - APot) in the surface ocean may include the deficiency of 210Bi to 210Pb (APbt - ABit) resulting from sinking of 210Bi attached to the particle in the ocean. We developed a model to elucidate a role of 210Bi in the behavior of 210Po-210Pb pair in the ocean. We assumed that the activities in the dissolved and particulate phases of 210Pb, 210Bi and 210Po in a given water column are determined by the concentration of particle in water column, input and output, distribution coefficients between dissolved and particulate phases, decay constants of these radionuclides. We estimated the 210Bi contribution to the 210Pb-210P
URI
https://sciwatch.kiost.ac.kr/handle/2020.kiost/26178
Bibliographic Citation
Goldschmidt 2014, pp.1254, 2014
Publisher
Geochemical
Type
Conference
Language
English
Publisher
Geochemical
Related Researcher
Research Interests

marine pollution management,marine biogeochemistry,marine environmental radioactivity,해양오염관리,해양물질순환,해양환경방사능

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