Abstract
Measurements of the gamma activity of atmospheric dust collected from surface air by an electrostatic precipitator at Satton, Surrey, were made since May 1959. Resolution of the energy spectra revealed three peaks at 0.43, 0.476, and 0.515 Mev, which are ascribed to Sb/sup 125/, Be/sup 7/, and Rh/sup 106/, respectively. Sb/sup 125/ and Be/sup 7/ were subsequently identified by chemical carrier and counting methods; Rh/sup 106/ and Sb/sup 125/ are fission products, while Be/sup 7/ is produced by cosmic radiation. Their concentrations are compared with results of various fission reactions; the ratios of fission product to Be/sup 7/ are found to remain relatively constant. (D.L.C.)
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