Investigation of material transport in rotating dryers by aid of 140La

In order to optimize material transport investigation in hot reactors, especially in rotating drum dryers, a Ba-La radioisotope generator for medium activities was developed and practically applied. To correct the influence of material depositions at the dryer walls on the residence time distribution, a non-linear background change was assumed and used for correction the residence time curves. An equation is postulated for describing the material transport through the dryer. The coefficients of this equation are determined by the least square method. A further generalization of this transport equation is offered. (author)