On radiocarbon and plutonium leakage to groundwater in the vicinity of a shallowland radioactive waste repository
A shallow-land radioactive waste repository operated in boggy forest environment since 1963. During the operation period of 26 years, a considerable amount of technogenic radionuclides, in solidified state, was disposed into the vault established in the geological structure at the depth of up to 3m. Environmental monitoring activities started after the closure of the repository. First, leakage of tritium was determined by measurement of its concentration in the groundwater, soil moisture as well as plants growing nearby. Penetration to the soil at short distances (0. 5m from the vault) of other nuclides such as <137>Cs, <226>Ra was confirmed in 2005. Recent investigations revealed transfer of radiocarbon and plutonium to the groundwater in the prevailing direction of its flow. Activity concentration of <239.240>Pu in non-filtered fraction of the groundwater from observation well No. 4 determined by alpha spectrometry was 6.4×10<5> Bq·L <1> in 2005, and 3. 2×10<-4> Bq·L<1> in 2006. Further analysis of colloid-facilitated transport of plutonium is planned. Variation of <14> C activity concentration in the same well was monitored in 2006. Resets imply further research into radiocarbon transfer to selected plant species.
14C groundwater plutonium repository tritium waste
A. Gudelis R. Gvozdaite V. Kubarevi ciene R. Druteikiene
Nuclear and Environmental Radioactivity Research Laboratory, Institute of Physics, Savanoriu Ave. 23 Nuclear and Environmental Radioactivity Research Laboratory, Instituteof Physics, Savanoriu Ave. 23
国际会议
第九届痕量元素生物地球化学国际会议(9th International Conference on the Biogeochemistry of Trace Elements)
北京
英文
396-397
2007-07-15（万方平台首次上网日期，不代表论文的发表时间）