Through the utilization of the GEANT4 tool integrated into SPENVIS, I aim to demonstrate the practicality and efficacy of simulating radiation hazards within spacecrafts orbiting in Low Earth Orbit (LEO). This research has two primary objectives: first, to assess the accuracy of these simulations by comparing them with historical dose assessments conducted on the International Space Station...
The GDML Workbench (https://github.com/KeithSloan/GDML) is an optional workbench available for the open source project FreeCAD (https://www.freecad.org). Geometry created within FreeCAD can be exported as a GDML file (for reading by Geant4); the workbench also can also import GDML files for viewing/editing. All the GDML geometry primitives are supported, plus several useful FreeCAD constructs,...
This presentation will be devoted to recent developments of the EM physics in Geant4 as well as those in the fast simulation domain. A focus will be in particular made on the Machine-Learning based techniques used in the fast simulation.
When cosmic rays or energetic solar particles strike the lunar surface, the secondary energetic particles that escape back into space carry information about the surface composition. These “albedo” particles are also a source of additional radiation exposure for astronauts or hardware at or near the lunar surface, which must be understood in order to plan for survivability of space missions...
Geant4 is currently being used to assist in the design (geometry and shielding) of the SHARP (Solar HARd X-ray Polarimeter) instrument of the PADRE (solar PolArization and Directivity X-Ray Experiment) mission. SHARP will determine the degree of polarization of solar flare non-thermal X-rays. I will present calculations done so far, including MDP (Minimum Detectable Polarization) and mu100. ...
Neutron radiation—encountered in healthcare, nuclear reactors, and the space environment—is extremely damaging to human health. On the lunar surface, galactic cosmic rays interact with the lunar regolith to produce albedo neutrons, which have energies ranging from sub-eV to tens of MeV, making it of critical importance to shield these albedo neutrons for manned space exploration missions....
Cosmic radiation can be divided into GCR (Galactic Cosmic Radiation) originating from outside the solar system, SCR (Solar Cosmic Radiation) originating from the Sun, and trapped particles in the Van Allen belt. Cosmic radiation is a high-energy particle that has a significant impact on satellites and humans operating in space. In particular, when cosmic radiation passes through electronic...
Abstract: In recent decades, 2D materials have garnered significant interest for electronic and optical applications, particularly in the aerospace sector. Understanding the potential damage to electronic devices and sensors based on 2D materials is crucial, especially given the critical need for effective yet lightweight radiation shielding to maintain the health of satellite sensors....
Abstract— This paper presents an investigation on the radiative environments that FPGA devices may encounter, elucidating the mechanisms that play a role in particle-matter interactions and their resulting consequences, notably single event upsets (SEUs). SEUs are soft errors triggered by ionizing particles, which impart charges to storage elements within FPGAs, including configuration memory...
In space radiation environment, SEU mitigation is crucial to guarantee total reliable operation of memory and FPGA devices. This paper presents the design of a an EDAC system based on the combination of partial TMR and the Quasi-cyclic codes implemented in SRAM-based FPGAs to protect SRAM memories against Single Event Upsets. Experimental results show that the proposed EDAC has smaller delay,...
Specific absorbed fractions (SAF) and S-values (S), which are related to internal radiation dosimetry, can currently be estimated using a variety of Monte Carlo tools, including MCNP and GATE, in order to prevent biological damage from being done to tissues and organs after they've been exposed to ionizing radiation. For physicists with coding skills, such tools make physics easier. However,...
A multiscale approach was developed for the first time and used to assess the early DNA radiation damage due to galactic cosmic ray (GCR) protons and the resulting backscattered lunar radiation (BLR) on the surface of the Moon using Geant4. Male and female astronauts were modelled using the ICRP145 tetrahedral mesh phantoms. GCR protons were modelled incident on the Moon surface with an...
Ultra-thin electromagnetic calorimeters exploiting electromagnetic processes in oriented crystals [1, 2] is a smart solution for gamma-ray space telescopes opening wide prospects for gamma-ray astronomy, in particular for the search of dark matter annihilation. Namely, these calorimeters allow to considerably reduce both the dimension and weight of gamma-ray space telescopes as well as to make...
In the space environment, semiconductors can be exposed to various radiation sources depending on mission conditions. Depending on the type, energy, and speed of radiation, different damage mechanisms occur. These can be broadly categorized into Total Ionizing Dose (TID) effects due to radiation accumulation and Single Event Effects (SEE) caused by the penetration of radiation particles. We...
In the space environment, changes in factors such as blood circulation under microgravity conditions can potentially result in modifications to the pharmacokinetic aspects of drug utilization, impacting drug absorption, distribution, metabolism, and excretion within the body. Nevertheless, assessing these alterations in a terrestrial setting can be challenging. Thus, there is a need for...
This study investigates the effect of mixing ratios on the compatibility and binding energy of polyvinylpyrrolidone (PVP) and polyacrylic acid (PAA) in polymer composites for radiation treatment using molecular dynamics (MD) and Monte Carlo (MC) simulations. Five simulation models were constructed by varying the composition ratio of PVP and PAA (1/9, 3/7, 5/5, 7/3, 9/1), and the solubility...
The tumor microenvironment (TME) consisting of blood and lymphatic vessels, fibroblasts, immune cells, and extracellular matrix (ECM) is a critical factor determining prognosis of anti-cancer drug treatment. Most of all, vasculature and ECM structures are the most influential factors in TME. The abnormal, tortuous and leaky tumor vasculature structure reduces chemical drug delivery to target...
Electron transport is dominated by angular deflections below 10 MeV, with large deviations from the continuous slowing down approximation, csda, and straight-ahead methods used for higher energies and for heavier atomic ions.
EMPC will present comparisons between adjoint Monte Carlo benchmarks and
ray-trace approximations for spherical, cylindrical, and rectangular geometries, using...
