Electron Microprobe Analysis of Fallout Particles

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Abstract
Electron microprobe analysis has been made on the highly radioactive fallout particles which originated from the first Chinese nuclear test explosion that was carried out on the land surface. Eight elements, Fe, Ca, Si, Al, K, Mn, Ti and P were confirmed to be present in the particles. It was found that the four elements, Fe, Ca, Si and Al were the main constituent metallic elements and that the darkness of particle color increased with the Fe composition. X-ray scanning images taken on several particles suggested that in some particles these elements were distributed rather heterogeneously. According to the results of electron microprobe analysis obtained formerly on the highly radioactive fallout particles which originated from a large scale air burst carried out by the U.S.S.R. in autumn 1962, the constituent metallic elements of these particles were Fe, A1 and Si, and these elements seemed to be quite uniformly distributed in the particles. The differences in the kind and distribution of the elements between the Chinese and the Soviet particles are ascribed to the differences in burst conditions.

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