【摘 要】
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210 Pb is a naturally occurring radionuclide with a half-life of 22.3 years; its significant sources for seawaters are atmospheric input and in situ product
【机 构】
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Laboratory for Marine Radioecology National Institute of Radiological Sciences Isozaki 3609,Hitachin
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210 Pb is a naturally occurring radionuclide with a half-life of 22.3 years; its significant sources for seawaters are atmospheric input and in situ production by decay of 226 Ra.A mooring of three time-series sediment traps was deployed at two sites in the western Northwest Pacific Ocean for nine months.Total mass fluxes and 210 Pb activities were determined for the settling particles to elucidate their scavenging and transport processes.Sediment samples also were analyzed for 210 Pb activities.The mass balance of 210 Pb at each sediment trap experiment site can be calculated from the total supply of 210 Pb to the water column and the loss of 210 Pb by radioactive decay in the water column.The total supply of 210 Pb to the water column is calculated as the sum of the 210 Pb production rate by decay of 226 Ra within the water column and the input rate of 210 Pb from the atmosphere.The loss of 210 Pb is given by the radioactive decay rate of 210 Pb calculated from the 210 Pb water column inventory.The difference between the total supply and loss of 210 Pb by radioactive decay represents the amount of 210 Pb removed by settling particles; this is called the 210 Pb deficiency flux.
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