Abstract
A simple method that computes the number of atoms in implanted samples from the integral of the elastic backseattering yield, using a pocket calculator, is represented. The energy dependence E-2, of the Rutherford law and the screening of the nuclear charge by the electron cloud is considered. The method is based on the assumption that the stopping power is a linearly decreasing function of the energy in the range from 1.4 MeV to 2 MeV. The total yield can be integrated analytically, and the number of atoms in the sample can then be ascertained by an iteration procedure that can be accomplished with a scientific pocket calculator, The results obtained are compared with the values obtained using the computer simulation code for RBS spectra RUMP.