Abstract
The technique of cutting based on the use of a laser beam is studied as a possible method in nuclear plant dismantling (OECD, 1982). The technique implies a relevant problem of contamination due to high aerosol production. Tests have been carried out to characterize the aerosol produced in cutting steel and concrete in terms of size spectrum, electric charge and chemical composition in comparison with bulk material composition. The high temperature value locally reached in the cutting zone causes material vaporization with emission of very fine primary particles. In such conditions aerosol coagulation is very fast (it occurs in less than 1s) and leads to aggregates. Research has been aimed at finding the characteristics of the aerosol removable from the cutting zone by ventilation and evaluating the morphology of the particles that diffuse at approximately 50 cm from the generation point, or settle on the cutting-box base.
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