We report on the first detailed measurements of electron backscattering from low Z targets at energies up to 124 keV. Both energy and angular distributions of the backscattered electrons are measured and compared with electron transport simulations based on the GEANT4 and Penelope Monte Carlo simulation codes. Comparisons are also made with previous, less extensive, measurements and with measur...

The purpose of this work is to extend the Geant4-DNA Monte Carlo toolkit include electron interactions with four DNA bases using a set cross sections recently implemented in Geant-DNA CPA100 models and available for liquid water. Electron interaction elastic scattering, ionisation, electronic excitation were calculated adenine, thymine, guanine cytosine. energy range extended relativistic elect...

Microbeam radiation therapy (MRT) is a new experimental oncological modality, intended for the treatment of inoperable brain tumours, particularly in difficult cases where conventional radiation therapy can cause irreversible damage. MRT consists of an array of highly collimated, quasi-parallel x-ray microbeams aimed at the tumour tissue, delivering high dose within the beam path and low doses ...

4 Background and Rate Studies 12 4.1 Neutrons . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 4.2 Photons and Low Energy Electrons . . . . . . . . . . . . . . . 13 4.3 A1 Background Rate Estimate . . . . . . . . . . . . . . . . . . 13 5 Simulation and Design 14 5.1 GEANT4 Simulation and Design Parameters . . . . . . . . . . 14 5.2 Physical Design . . . . . . . . . . . . . . . . ....

introduction: spatial dose distribution around the radionuclides sources is required for optimized treatment planning in radioimmunotherapy. at present, the main source of data for cellular dosimetry is the s-values provided by mird. however, the mird s-values have been calculated based on analytical formula in which no electrons straggling is taken to account. in this study, we used geant4-dna...

The determination of the microscopic dose-damage relationship for DNA in an aqueous environment is of a fundamental interest for dosimetry and applications in radiation therapy and protection. We combine geant4 particle-scattering simulations in water with calculations concerning the movement of biomolecules to obtain the energy deposit in the biologically relevant nanoscopic volume. We juxtapo...

The employment of Monte Carlo simulations in the applied nuclear physics techniques has increased with the data processing capabilities of the commercial personal computers. Since the inclusion of the low-energy electromagnetic interactions in GEANT4, this Monte Carlo simulation toolkit has produced results which reveal its promising utilization in radiation dosimetry, radiation protection and ...

Modeling the radio-induced effects in biological medium still requires accurate physics models to describe the interactions induced by all the charged particles present in the irradiated medium in detail. These interactions include inelastic as well as elastic processes. To check the accuracy of the very low energy models recently implemented into the GEANT4 toolkit for modeling the electron sl...