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  • 1 University of Arkansas Department of Chemistry 72701 Fayetteville AR (USA)
  • | 2 University of Cross River State, UYO, C. R. State Pure and Applied Chemistry Department Nigeria
  • | 3 c/o Tony Useche Parque Central Apartado Postal No. 17409 1010 Caracas Venezuela
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Marked increases in the concentrations of thorium and uranium isotopes observed in rain samples collected at Fayetteville (36° N, 94° W), Arkansas, during 1983 are attributed to the fallout from the 1982 eruption of El chichón volcano in Mexico.