In a second step the density distribution is analyzed using an X-ray measuring path. The measured radiation distribution is used to determine the weight distribution (mass per area) for each particle and is also stored in the database. The measurement is very similar to a medical X-ray examination. Bones which have high density absorb the radiation stronger than flesh where the density is smaller. Therefore bones are shown brighter than the flesh on X-ray images.Basically, this image does not show the density but the mass per area which was transmitted by the radiation.Finally the combination of both (optical and radiometric)measurements gives the density of each particle.
Given the fact that the information about every single particle is stored in a database and can be retrieved easily the evaluation of the sample can be done using different criteria. Beside distribution functions like mass vs. density or volume vs. density even geometrical parameters can be evaluated. Outliers can be easily identified and evaluated just by a click on the data point.
Optionally the particles can be sorted at the end of the belt according to their size or density for further evaluation. Also additionally measurement pathes are optionally available.
The evaluation of the measured data is done with the RACCOON software.