@inproceedings{oai:repo.qst.go.jp:00054303,
 author = {Zheng, Jian and Yamada, Masatoshi and 鄭 建 and 山田 正俊},
 book = {Proceedings of the Workshop on Environmental Radioactivity (KEK Proceedings)},
 issue = {2011-7},
 month = {Nov},
 note = {We participated in the interlaboratory comparison tests organized by the IAEA Marine Environment Laboratory in Monaco for the certification of this new reference material, analyzed the activities of 239Pu, 240Pu, 239+240Pu, 241Pu, the atom ratio of 240Pu/239Pu, and the activity ratio of 241Pu/239+240Pu by a highly sensitive isotope dilution SF-ICP-MS method combined with two-stage chromatographic separation and purification. Detailed results of Pu activity and isotope composition will be reported. With a mean chemical yield of 65 % for 242Pu tracer, we found that the experimentally established values for 239Pu, 240Pu, 241Pu and 239+240Pu activities are almost the same as those in the IAEA-381 seawater reference material. Regarding the 239+240Pu activity, we provided the most precise and accurate result among the twelve laboratories participated in the interlaboratory comparison.},
 pages = {117--123},
 title = {Precise determination of Pu isotopes in a newly certified seawater reference material IAEA-443 using isotope-dilution SF-ICP-MS},
 year = {2011}
}