On the role of 210 Bi in the apparent disequilibrium of 210 Pb-210 Po at sea

Journal of Environmental Radioactivity
Suk Hyun Kim, Gi-Hoon Hong

Abstract

The disequilibrium of the grandparent-daughter pair 210Pb (t1/2=22.3 years)-210Po (t1/2=138 days) has been used to estimate the export fluxes of particulate organic carbon in the ocean using particulate-matter-associated 210Po. 210Po is produced from 210Bi, not from 210Pb. The half-life of 210Bi (t1/2=5.01 days) is sufficiently long compared to the rates of biological particle formation and decomposition or dissolution occurring at sea. The role of 210Bi has not yet been assessed quantitatively in the apparent disequilibrium between 210Pb and 210Po, partly due to the non-existence of 210Bi depth profile measurements at sea up to now. However, greater affinity of 210Bi over 210Po and 210Pb was found recently in coastal waters and phytoplankton 207Bi uptake experiments. Build upon these findings, we developed a primitive and simple analytical approach to elucidate the role of 210Bi in the 210Po-210Pb pair in the ocean using a simplified two-box irreversible steady-state ocean model. We assumed that the activity concentrations in the dissolved and particulate phases of 210Pb, 210Bi, and 210Po in a given water column are solely determined by the concentration of the particles, their input and output, the distribution coefficients b...Continue Reading

References

Apr 25, 2003·Nature·Pierre de MarcillacJean-Pierre Moalic
Oct 24, 2006·Journal of Environmental Radioactivity·P BossewA Hubmer
Apr 23, 2014·Applied Radiation and Isotopes : Including Data, Instrumentation and Methods for Use in Agriculture, Industry and Medicine·Hyun Mi LeeYoung Ill Kim
Jul 6, 2014·Journal of Environmental Radioactivity·Wuhui LinShi Zeng
Jan 30, 2018·The Journal of Physical Chemistry. a·Regla AyalaEnrique Sánchez Marcos

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