Background: Hadron therapy for malignant tumor is becoming increasingly popular. There are many factors which effect on implementation of a proper treatment planning. The purpose of this work is to investigate the inhomogeneity effects as affecting factor on proton range, Full width at half maximum (FWHM) and 20% position of penumbra (P20) by MCNPX code. Materials and Methods: An inhomogeneous ...

We have investigated the validity of our simulator. The validation item that we have already performed are summarized as follows. 1. Whether the energy loss distribution follows the Landau’s distribution. • thin absorber of Silicon 2. Whether the energy loss along per unit length follows the formula of Bethe-Bloch for protons. • thick absorber of Silicon • thick absorber of Lead 2 Landau’s dist...

introduction range and diffusion of positron-emitting radiopharmaceuticals are important parameters for image resolution in positron emission tomography (pet). in this study, geant4 toolkit was applied to study positron diffusion in soft tissues with and without a magnetic field for six commonly used isotopes in pet imaging including 11c, 13n, 15o, 18f, 68ga, and 82rb. materials and methods gea...

We study the spatial distributions of β-activity produced by therapeutic beams of He and C ions in various tissue-like materials. The calculations were performed within a Monte Carlo model for Heavy-Ion Therapy (MCHIT) based on the GEANT4 toolkit. The contributions from positronemitting nuclei with T1/2 > 10 s, namely 10,11C, N, 14,15O, 17,18F and P, were calculated and compared with experiment...

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...