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A toolkit? More a building set. But you get the idea. You can build what you want, tailor it to your requirements, but you have to build it yourself. That makes it flexible and versatile; it is also fun.Geant4 is a body of C++ code that models and simulates the interaction of particles with matter. The code is distributed freely under an open software license 1 For the Geant4 licence, http://geant4.web.cern.ch/geant4/license/LICENSE.html [Google Scholar]. Documentation, source code, databases and, for some computer platforms, binary libraries can be downloaded from the Geant4 website 2 The Geant4 website http://geant4.cern.ch [Google Scholar]. Being a toolkit means you have to learn how it works and find good ways of putting the pieces together and to help you do this, Geant4 comes with many examples and a Web-based documentation system.
John Allison (Mon,) studied this question.
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