Why weight of each sample must be ~ 50 g at sandstone density?
The shape of the container (glass vial) used for cutting sample storing has to be similar to that of standard sample. Volume of cuttings inside the container has to be close to volume of the standard sample, see figure 4 below. Figure 4: Examples of the cuttings and standard samples. Volume of the standard sample (doped water) is about 18-21 cc. So for a sandstone with density =2.65 g/cc we will need about 50g of rocks to have the same volume as filled vial. And still, signal from porous media will be significantly less than from signal from standard sample (porous media just % from whole volume), therefore S/N will be less than on S/N ratio obtained on standard.
