This master thesis is a continuation of previous work done at Elekta Instrument AB for the joint objective of developing the Monte Carlo simulation program, Pegasos, for proton therapy. For this purpose, neutron transport with nuclear interactions has been implemented into the Pegasos framework. Nuclear data is provided from the TALYS nuclear code and for neutron-hydrogen nuclear interactions, ...

This study of doses to patients from emitted photoneutrons in a medical linear accelerator (Varian 2100C) was carried out. Dose calculation was performed using Monte Carlo Geant4 code. The model was used to calculate the neutron fluence, as a function of the neutron energy inside the treatment room to estimate the effective dose to patients. The ambient dose equivalent versus field size for pat...

  Introduction: Arrays of segmented scintillation crystals are useful in megavoltage x-ray imaging detectors for image-guided radiotherapy. Most previous theoretical studies on these detectors have modelled only ionizing-radiation transport. Scintillation light also affects detector performance. ScintSim1, our previously reported optical Monte Carlo code for such detector...

Full detector simulation is known to consume a large proportion of computing resources available the LHC experiments, and reducing time consumed by will allow for more profound physics studies. There are many avenues exploit, in this work we investigate those that do not require changes GEANT4 suite. In study, several factors affecting full execution investigated. A broad range configurations h...

As simulation system, the variety of physics processes implemented is one of the most important functionalities. In that sense, Geant4 is one of the most powerful simulation toolkits. Its flexibility and expansibility brought by object-oriented approach make it possible for us to easily assimilate external simulation packages into the Geant4 system as modules of physics processes. We developed ...

As simulation system, the variety of physics processes implemented is one of the most important functionalities. In that sense, Geant4 is one of the most powerful simulation toolkit s. Its flexibility and expansibility brought by object-oriented approach make it possible for us to easily assimilate external simulation packages into the Geant4 system as modules of physics processes. We developed...

We present the package for simulation of DM (Dark Matter) particles in fixed target experiments. The most convenient way this (and only possible case beam-dump) is to simulate it framework program tracing experimental setup. One popular such programs Geant4. Specifically, includes processes production via electron and muon bremsstrahlung off nuclei, resonant in-flight positron annihilation on a...