Abstract
The causes and effects of high concentrations of shorterlived fission products in fall-out in New York City during 1958 and 1959 are discussed. Data previously reported are supplemented with data on concentrations of Sr/sup 90/, Cs/sup 137/, Ru/sup 106/, Ce/sup 144/, Sr/sup 89/, Zr/sup 95/, and W/sup 18/ s/ sup 5/ measured in monthly fallout collections during 1959. Examination shows that the shorter-lived fission products predominated over Sr/sup 90/ and Cs/sup 137/ from the beginning of 1958 through the middle of 1959. Through analysis of isotope ratios, W/sup 185/ concentrations, and monthly rainfall volumes, it was established that more fallout arrived in New York City from the Soviet series in October 1958 than from earlier series, and that the Soviet debris was richer in short-lived nuclides because it was deposited sooner after its production. Methods, age and origin of debris, air activity concentrations, and gamma dose are all discussed. The calculated contributions of the fall-out that accumulated on the ground in New York City during 1958 and 1959 to external gamma radiation dose rates and to long term doses are both illustrated and tabulated. (P.C.H.)
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