Fluences of particles per primary photon generated at the depth of 5 cm from the monoenergetic photon source inside and outside of the original beam: 1 – electrons inside the beam; 2 – electrons outside the beam; 3 – primary photons inside the beam; 4 – primary photons outside the beam; 5 – secondary photons inside the beam; 6 – secondary photons outside the beam; 7 – positrons inside the beam; 8 – positrons outside the beam. Thin lines indicate the corridors of statistical uncertainties of calculations; upper straight line corresponds to the initial fluence of the source (photon fluence at the depth of 0 cm).