Global fallout levels of 99Tc and activity ratio of 99Tc/137Cs in the Pacific Ocean |
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| Authors: | N. Momoshima M. Sayad M. Yamada M. Takamura H. Kawamura |
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| Affiliation: | (1) Faculty of Science, Kumamoto University, Kurokami, Kumamoto 860-8555, Japan;(2) National Atomic Energy Agency, Complex Puspiptek-Serpong, Tangerang, Indonesia;(3) National Institute of Radiological Sciences, Isozaki-cho, Hitachinaka 311-1202, Japan;(4) Faculty of Science, Kumamoto University, Kurokami, Kumamoto 860-8555, Japan;(5) Kyushu Environmental Evaluation Association, Matuskadai, Higashi-ku, Fukuoka 813-0004, Japan |
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| Abstract: | Summary Global fallout levels of 99Tc and 137Cs of surface seawater in the Pacific Ocean were measured. The 99Tc concentrations ranged from 0.62 to 3.33 mBq. m-3and 5 of 6 samples showed less than 1 mBq. m-3except one sample taken in the Great Barrier Reef, Australia. The 137Cs concentrations ranged from 2.13 to 3.14 Bq. m-3, showing a gradual decrease in the North Pacific toward the equator and a constant level in the South Pacific. The 99Tc/137Cs activity ratios ranged from 2.5. 10-4to 2.9. 10-4, which is very close to that calculated theoretically from the fission yield. |
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