Radiometric control systems for refuse discharge in a jig

Abstract

The paper presents the results of industrial investigations on radiometric control systems for refuse discharge from a jig. A new monitoring system based on the monitoring of the natural radiation emitted by the material in the separation zone of a jig compartment has been developed and tested in parallel with the radiometric density meter and the conventional float. The correlation between the separation density monitored by the radiation density meter and the intensity of the natural radiation has been investigated. The correlation coefficient was ca. r = 0.973 and the standard deviation of the measurement in regression with the density meter indications was sc = 0.034 g/cm3. This shows that after a float as a measuring unit in the control system is replaced by a natural radiation monitor, good stabilisation of the separation density can be expected. The paper discusses advantages of such systems over the float based systems. This system can stabilise the desired quality of products without the intervention of an operator.