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After the stop of the atomic bomb tests in October 1958 samples of fission products have been collected from air and investigated by autoradiographic methods. The blackening spots were measured and the frequency distribution of the particles was determined over the range of 2· 10 -12  Curie down to 0.5· 10 -14  Curie. In relation to the total activity of fission products the number of particles containing 2.10 -12  Curie decreased quickly, while that of particles smaller than 10 -13  Curie became constant after a rapid initial drop.

Untersuchungen der Struktur von Spaltproduktschwaden