Abstract
Abstract The atmospheric fractionation of induced radionuclides is discussed in some detail on the basis of results obtained by making a radiochemical analysis of fresh nuclear debris originating from recent Chinese nuclear test explosions. Among fresh nuclear debris particles collected at Niigata about 4000km downwind from the Chinese test site, the trend for the enrichment of 239Np was somewhat modified as compared with that derived from an averaged sample collected by a large-scale and high-altitude sampling procedure; more 239Np was present in smaller-size fallout particles. Furthermore, it was found, in rain-water samples collected after the third Chinese nuclear explosion, that the atomic ratio at time-zero of 60Co/95Zr increased with a decrease in the 95Zr-concentration in rain and vice versa. This suggests that the atmospheric fractionation of 60Co-rich particles from 95Zr-rich ones takes place during the travel of atomic clouds around the world.
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