한반도 주변 해양생물에서 Pu-239+240 과 Po-210 의 농축

Abstract

The concentrations of 239+240Pu and 210Po were determined in the marine biota of several tropic levels around Korean Peninsula to understand the bioaccumulation of these alpha emitter radionuclides. Marine biota including phytoplankton, zooplankton, macroalgae, crustaceans, mollusks, surface water fish, bottom water fish and cephalopods were collected in 2014. The concentrations were measured in the parts of skin, muscle and internal organs if possible to be separated. The concentrations of 239+240Pu in collected biota were the highest in phytoplankton with 68.5±0.3 mBq/kg&#8226 ww and had descending order of phytoplankton > zooplankton (8.73±0.03) > abalone (5.38±0.02) > sea mustard (0.821±0.004) > laver (0.448±0.002) > flat fish (0.368±0.010) > anchovy (0.305±0.001) > mackerel (0.281±0.010) > squid (0.274±0.010) > red-banded lobster (0.139±0.010) : (unit: mBq/kg&#8226 ww). This indicates that 239+240Pu is highly accumulated in phytoplankton but the accumulation factor does not increase in upper tropic levels. The concentrations of 210Po in phytoplankton and zooplankton were 137±4 and 111±4 Bq/kg&#8226 ww, respectively. The concentrations of 210Po in the whole body of anchovy preying on zooplankton was 392±13 Bq/kg&#8226 ww which is higher than that in zooplankton. The concentrations of 210Po in the muscle of squid, abalone, red-banded lobster, mackerel and flat fish were 8.6±0.3, 3.4±0.1, 2.8±0.1plankton, macroalgae, crustaceans, mollusks, surface water fish, bottom water fish and cephalopods were collected in 2014. The concentrations were measured in the parts of skin, muscle and internal organs if possible to be separated. The concentrations of 239+240Pu in collected biota were the highest in phytoplankton with 68.5±0.3 mBq/kg&#8226 ww and had descending order of phytoplankton > zooplankton (8.73±0.03) > abalone (5.38±0.02) > sea mustard (0.821±0.004) > laver (0.448±0.002) > flat fish (0.368±0.010) > anchovy (0.305±0.001) > mackerel (0.281±0.010) > squid (0.274±0.010) > red-banded lobster (0.139±0.010) : (unit: mBq/kg&#8226 ww). This indicates that 239+240Pu is highly accumulated in phytoplankton but the accumulation factor does not increase in upper tropic levels. The concentrations of 210Po in phytoplankton and zooplankton were 137±4 and 111±4 Bq/kg&#8226 ww, respectively. The concentrations of 210Po in the whole body of anchovy preying on zooplankton was 392±13 Bq/kg&#8226 ww which is higher than that in zooplankton. The concentrations of 210Po in the muscle of squid, abalone, red-banded lobster, mackerel and flat fish were 8.6±0.3, 3.4±0.1, 2.8±0.1