Industrial waste was studied concerning its radioactive pollution. Using kn
own properties of;the solid state nuclear track detector CR-39 we found amo
ng a high concentration of more or less homogeneously distributed single ct
-tracks discrete spots of very high enrichments of cl-particles created by
so called hot particles. We will. report about the alpha-activity, the conc
entration of hot particles and about their ability to be air borne.