Global transport rates of Cs and Pu originating from the Nagasaki A-bomb in 1945 as determined from analysis of Canadian Arctic ice cores |
| |
| Authors: | A. Kudo J. Zheng R.M. Koerner D.A. Fisher D.C. Santry Y. Mahara M. Sugahara |
| |
| Affiliation: | a1Institute for Environmental Research and Technology, National Research Council of Canada, Ottawa, Canada K1A 0R6;a2Glaciology Section, Geological Survey of Canada, Natural Resources of Canada, Ottawa, Canada K1A 0R8;a3Institute of National Measurement Standards, National Research Council of Canada, Ottawa, Canada K1A 0R6;a4Central Research Institute of Electric Power Industry, Abiko-Shi, Chiba, Japan;a5Department of Environmental Engineering, Osaka Sangyo University, Daito-shi, Osaka-fu, Japan |
| |
| Abstract: | Recent advancements in analytical technology make it possible for artificial radionuclides released from nuclear explosions to be detected in Arctic ice core layers. The fission product, 137Cs, and the unexpended fission material, 239+240Pu, originating from the Nagasaki A-bomb of August 1945, were measured by collecting 10 ice cores on the Agassiz ice cap, Ellesmere Island, Canada. The deposition rates were 0·020 mBq cm-2 for 137Cs and 0·0016 mBq cm-2 for 239+240Pu, originating from Nagasaki. Assuming the radionuclides, excluding the amount fissioned from the explosion and deposi-ted as local fallout, are deposited evenly throughout the Northern Hemisphere, 67% of the expected amount of 137Cs reached the Arctic while 1·1% of 239+240Pu reached the Arctic. The results suggest that different transport mechanisms exist for various contaminants in the global transport system. |
| |
| Keywords: | |
| 本文献已被 ScienceDirect 等数据库收录！ |
|
