Gabriele Cosmo*** microprox example *** Author: S. Incerti et al. Date: March 2nd, 2019 Email: incerti@lp2ib.in2p3.fr (c) The Geant4-DNA collaboration. This example shows how to compute proximity functions in liquid water using exclusively Geant4-DNA physics processes and models. This example is provided by the Geant4-DNA collaboration. These processes and models are further described at: http://geant4-dna.org Any report or published results obtained using the Geant4-DNA software shall cite the following Geant4-DNA collaboration publications: J. Appl. Phys. 125 (2019) 104301 Med. Phys. 51 (2024) 5873–5889 Med. Phys. 45 (2018) e722-e739 Phys. Med. 31 (2015) 861-874 Med. Phys. 37 (2010) 4692-4708 Int. J. Model. Simul. Sci. Comput. 1 (2010) 157–178 1) Geometry An infinite box of liquid water. 2) Incident particles Particles can be selected from the microprox.in macro as well as their incident energy. They are shot from the center of the box. Tracking cut can also be selected (as energy). 3) Physics The default Geant4-DNA physics constructor 2 is used in the PhysicsList class. Alternative constructor can be selected from microprox.in 4) Scoring of enery deposition Energy depositions are scored in spherical shells from randomly selected hits. The user can select the dimensions of the shells as well as radius steps in TrackerSD.cc. 5) The code can be run using: ./microprox microprox.in 6) Results can be analyzed after the run using: root plot.C The distribution of t is shown by default.