NUKLEONIKA 2005, 50(Supplement 1):S45-S48

In the paper there are presented the results of plutonium ²³⁸Pu, ^239+240Pu and ²⁴¹Pu determination in different samples of the Baltic Sea environment. ²³⁸Pu and ^239+240Pu isotopes were measured in alpha spectrometer and ²⁴¹Pu results were calculated indirectly by activity measurements of ²⁴¹Am isotope increase from b-emitting ²⁴¹Pu in 16-18 years after Chernobyl accident. The results indicate that the Baltic organisms accumulate plutonium from environment and the bioconcentration factors (BCF) range from 100 for fish to 27,000 for priapulida (benthic organisms) and only 0.1% of total plutonium is deposited in living organisms. Almost whole plutonium is deposited in Baltic sediments (about 99%). The results of ²⁴¹Pu determination indicate that after Chernobyl accident indicate on its high concentration in analyzed components of the Baltic Sea ecosystem and the highest value of the activity ratios ²⁴¹Pu/^239+240Pu were found in seawater (140).