From UCL HEP PBT Wiki
This is a tutorial about applications of GEANT4 to medical physics. The GEANT4 is installed on the HEP Linux cluster at UCL. You will need an account on that cluster to be able to use this software, run example tutorials and create your own applications.
Accounts and Registration
- Getting a computing account
Apply for a computing account on the HEP Linux cluster by sending e-mail to HEPComputingSupport. In your e-mail you have to state the reason for your application (e.g. medical physics student who will use GEANT4 on the HEP cluster).
You will receive an e-mail from the HEP computing support with your username and password. Now you can log in to the HEP cluster “plus1” via ssh email@example.com. Your personal area will be at /home/username/.
- Where to get help
You can write to the discussion forum. Useful help links.
The basics of GEANT4
GEANT4 is a toolkit for simulating the passage of particles through matter. The user creates his/her own simulation application using GEANT4 tools. The tools are base classes. There are eight base classes.
- Three classes are mandatory
- Describe the experimental setup, geometry and materials
- Define particles, physics processes and range cuts
- Describe particle source, source dimensions, initial position, energy spectrum, angular distributions
- The rest are optional
- Define and store histograms
- Event selection and analysis of simulation data
- Customize priority of tracks
- Decide whether a trajectory should be stored or not
- Kill, suspend, postpone a track
You can create your own classes which are derived from the base classes. All of them should be registered with the G4RunManager. In function main() which is the skeleton of your simulation code you instantiate G4RunManager and notify it of your mandatory and optional classes.
This section includes several basic tutorials:
- Monoenergetic photon pencil beam is a simple code which shows the dose distribution in water along the incident monoenergetic photon beam.
- Monoenergetic proton pencil beam is a simple code which shows the dose distribution in water along the incident monoenergetic proton beam.
- Proton beam with realistic geometry is a more complex code with realistic geometry of the proton beam. It shows the dose distribution in water along the beam. There are two options for the beam geometry:
- Gaussian beam profile
- Beam profile from phase space files
- Several proton beams with spread out Bragg peaks is a complex code which shows the dose distribution in water with several incident monoenergetic proton beams.
This section includes several advanced tutorials: