Marked variations of the I34 U/ 23, Uand 235 U/"'U ratios observed in rain samples collected at Fayetteville (36°N, 94°W), Arkansas, during the period between January 1985 and May 1986 appear to be attributable to the 7 February 1983 burn-up of the nuclear-powered Soviet satellite Cosmos-1402. Sharp increases in the 23S U/ 23, U ratios occurred in many of the rain samples collected during the fall of 1983 through the early spring of 1984, while no comparable variations in the 234 U/ 53, U ratios were observed. These results indicate that the 1983 -1984 fallout of 23s U had its origin most likely in the Chinese nuclear test of October 16, 1980.