Geant4 User's Guide for Application Developers - Geant4 - CERN

Appendix# a target box is placedglobal targettarget= G4EzVolume("Target")au= G4Material.GetMaterial("G4_Au")target.CreateTubeVolume(au, 0., 1.*cm, 1.*mm)target.PlaceIt(G4ThreeVector(0.,0.,-10.*cm))8.3.2. NISTmaterials moduleThe NISTmaterials module provides an instant use of Geant4 NIST materials. An example code for creating NISTmaterials:from Geant4 import *import g4py.NISTmaterialsg4py.NISTmaterials.Construct()print Geant4.gMaterialTable8.3.3. ParticleGun moduleThe ParticleGun module provides a primary generator action with G4ParticleGun. An example code is shownhere:import g4py.ParticleGun# normal way for constructing user primary generator action#pgPGA= g4py.ParticleGun.ParticleGunAction()#gRunManager.SetUserAction(pgPGA)#pg= pgPGA.GetParticleGun()# 2nd way, short-cut waypg= g4py.ParticleGun.Construct()# set parameters of particle gunpg.SetParticleByName("e-")pg.SetParticleEnergy(300.*MeV)primary_position= G4ThreeVector(0.,0., -14.9*cm)primary_direction= G4ThreeVector(0.2, 0., 1.)pg.SetParticlePosition(primary_position)pg.SetParticleMomentumDirection(primary_direction)8.4. ExamplesThere are some examples of Geant4Py in the directories "tests/" and "examples/".In the "tests/" directory,gtest01 : exposes a user applicationgtest02 : test for using site-module packagesgtest03 : test for ezgeom packagegtest04 : test for getting command tree and command informationgtest05 : test for constructing CSG geometries in Pythongtest06 : test for constructing/visualizing boolean geoemtriesgtest07 : test for checking overlapped geometriesThe "examples/" directory contains a set of examples of Geant4Py.demos/water_phantomAn example of "water phantom dosimetry". This demo program shows that a Geant4 application well coworkswith Root on Python front end. VisManager, PrimaryGeneratorAction, UserAction-s, histogramming withRoot are implemented in Python;• dose calculation in a water phantom• Python overloading of user actions• on-line histogramming with Root• visualization306