Surface distribution of artificial radioactivity in the North Pacific in 1978.
The surface distributions of certain artificial radioactive fallouts,that is 90Sr, 137Cs, 144Ce and I06Ru, in the North Pacific in 1978 were obtained by radiochemical analysis. The 90Sr concentration decreases with lowering latitude and shows a discontinuous change at about 33°N.This has not been found in previous results. The 137Cs concentration has its maximum between 30°N and 35°N and decreases with increasing distance from that latitudinal zone. This kind of latitudinal distribution generally agrees with the other results. The latitudinal zone having this maximum concentration is located in a lower latitude than that of the maximum fallout rate by 5°or 10°. The distributions of 144Ce and 106Ru in this area have been obtained for the first time and appear to show a gradual decrease with lowering latitude. The difference between the distributions of 137Cs and of 144Ce and 106Ru suggests that the latitudinal distribution of the fallout in oceans depends on the amount of fallout and the elapsed time from deposition into sea.
| Main Authors: | , |
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| Format: | Journal Contribution biblioteca |
| Language: | Japanese |
| Published: |
1981
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| Online Access: | http://hdl.handle.net/1834/16249 |
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