Dear colleagues

when I use the cup technique to determine the alpha emitters of the measured samples by SSNTDs, how can I canceled the effect of using different weights of the samples on the number of tracks registered ? i.e. the number of the tracks registered when I use 20 gm of the sample is less than the number of the tracks when I use 50 gm of it.

my question is there any equation exist to overcome the difference in the weight of the samples.