Mass Spectrometric Determination of Uranium and Thorium Traces in Aerosols, Collected over Russian Territory after 'Fukushima-1' Accident

摘要

Secondary Ion Mass-Spectrometry was used to detect the isotopes ~(238)U and ~(232)Th in aerosols, sampled after damage of the "Fukusima-1" atomic station. The isotopes present only on the surface of the particles, so, fuel assemblages were melted, and they penetrated into environment through the gaseous phase without leakage of a solid substance in the form of primary aerosols. The presence of ~(232)Th is treated as a sign of ~(233)U production.