Abstract
The chemical compositions, structures and modes of origin of several different types of radioactive fall-out particles have been determined through petrographic techniques, X-ray diffraction analysis, radioautography and specially prepared reagent films for liquid fall-out. The fall-out particles studied were collected following the detonation of nuclear weapons under various conditions at both the Nevadta Test Site and the Eniwetok Proving Grounds. Radioactive fall-out particles were formed by the interaction of the condensing vaporized metals and fission products derived from the bomb and associated structures with the surface material swept up into the cooling fireball. Descriptions of the various types of fall-out particles are given and their modes of origin are qualitatively related by a simplified thermodynamic treatment.
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