Barghouty, A. F.

Sabra, Mohammad

NASA Technical Reports Server

Geant4 predictions of 
energy spectra in typical 
space radiation 
environment
MOHAMMAD S SABRA, NASA POSTDOCTORAL 
PROGRAM FELLOW, NASA-MSFC
A.F. BARGHOUTY, ASTROPHYSICS OFFICE, NASA -
MSFC
4/2/2014
2014 APS APRIL MEETING, SAVANNAH, GA 
M.S.SABRA & A.F.BARGHOUTY
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https://ntrs.nasa.gov/search.jsp?R=20140010119 2019-08-31T20:00:40+00:00Z
Outline
Space radiation work at MSFC
Sample Projects
Sample Results using Geant4
Remarks
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2014 APS APRIL MEETING, SAVANNAH, GA 
M.S.SABRA & A.F.BARGHOUTY
Space Radiation Environment
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2014 APS APRIL MEETING, SAVANNAH, GA 
M.S.SABRA & A.F.BARGHOUTY
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• From Wilson et al., NASA Reference Publications 1257 (1991) 
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2014 APS APRIL MEETING, SAVANNAH, GA 
M.S.SABRA & A.F.BARGHOUTY
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Space radiation work at 
NASA-MSFC
Particle Detection: Marshall designs, builds and 
tests/flight tests solid-state charged (protons 
from trapped, solar, and galactic origin) and 
neutral (neutrons-secondary products) particle 
detectors over a wide energy range
Shielding: Exposure and characterization of 
candidate shielding materials to protons and heavy 
ions at various accelerators (e.g., IUCF and NASA’s 
SRL)
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2014 APS APRIL MEETING, SAVANNAH, GA 
M.S.SABRA & A.F.BARGHOUTY
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Space radiation work at 
NASA-MSFC
Radiation Hardening: Marshall with Vanderbilt 
Univ.’s ISDE developed an advanced, online 
radiation-effects-on-electronics simulation tool 
known as Crème (replaced the widely known, NRL 
developed) Creme96; 
https://crème.isde.vanderbilt.edu
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2014 APS APRIL MEETING, SAVANNAH, GA 
M.S.SABRA & A.F.BARGHOUTY
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Space radiation work at 
NASA-MSFC
Prediction: Marshall with UAH developed a state-
of-the-art, near real time, an “all-clear” forecasting 
tool for solar flares, coronal mass ejections (CMEs) 
and solar particle events (SPEs), known as ‘Mag4’: 
http://www.uah.edu/cspar/research/mag4-page
Analysis & Simulation: radiation environment 
modeling; detector response; radiation-transport; 
dose and shielding analysis
Sample Projects
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2014 APS APRIL MEETING, SAVANNAH, GA 
M.S.SABRA & A.F.BARGHOUTY
4/2/2014
2014 APS APRIL MEETING, SAVANNAH, GA 
M.S.SABRA & A.F.BARGHOUTY
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Advanced Neutron 
Spectrometer (ANS)
ANS is an advanced radiation detection 
instrument that meet the requirements for future 
human exploration missions. Its objective is 
accurately measure the neutron spectrum on 
manned mission beyond the Low Earth Orbit (LEO)
4/2/2014
2014 APS APRIL MEETING, SAVANNAH, GA 
M.S.SABRA & A.F.BARGHOUTY
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JEM-EUSO
The Japanese Experimental Module-Extreme 
Universe Space Observatory (JEM-EUSO) is an 
observatory that uses the earth's atmosphere as a 
detector to detect the extreme energy cosmic rays 
~ 1020 eV. 
Sample 
Simulation Results 
using Geant4
4/2/2014
2014 APS APRIL MEETING, SAVANNAH, GA 
M.S.SABRA & A.F.BARGHOUTY
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Simulation Setup
Geant4 application is developed to simulate the 
interaction of different beams on different targets,
For both configurations (Spherical-shell & Slab):
Incident beam: Proton and Iron,
Incident energy range: 0.2, 0.4, 0.6, 1.0 GeV/u,
Target: Al, Water,
Target thickness = 15 g/cm2,
Simulated energy spectra: e+/e-, γ, n, p, d, t, 3He, α
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2014 APS APRIL MEETING, SAVANNAH, GA 
M.S.SABRA & A.F.BARGHOUTY
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Geometry configuration
4/2/2014
2014 APS APRIL MEETING, SAVANNAH, GA 
M.S.SABRA & A.F.BARGHOUTY
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G4 Nuclear Physics Models
The following nuclear physics models are tested:
a) G4-INCLXX: Updated version of the 
intranuclear cascade model (INCL++) that can 
handle heavy-ion collisions,
b) G4-Shielding: Based on Bertini model, and 
Quantum-Molecular-Dynamics (QMD) model,
c) Binary Cascade Model (BIC),
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2014 APS APRIL MEETING, SAVANNAH, GA 
M.S.SABRA & A.F.BARGHOUTY
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Simulation Results
4/2/2014
2014 APS APRIL MEETING, SAVANNAH, GA 
M.S.SABRA & A.F.BARGHOUTY
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4/2/2014
2014 APS APRIL MEETING, SAVANNAH, GA 
M.S.SABRA & A.F.BARGHOUTY
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Shell Configuration
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2014 APS APRIL MEETING, SAVANNAH, GA 
M.S.SABRA & A.F.BARGHOUTY
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Shell Configuration
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2014 APS APRIL MEETING, SAVANNAH, GA 
M.S.SABRA & A.F.BARGHOUTY
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Shell Configuration
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2014 APS APRIL MEETING, SAVANNAH, GA 
M.S.SABRA & A.F.BARGHOUTY
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Shell Configuration
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2014 APS APRIL MEETING, SAVANNAH, GA 
M.S.SABRA & A.F.BARGHOUTY
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Shell Configuration
4/2/2014
2014 APS APRIL MEETING, SAVANNAH, GA 
M.S.SABRA & A.F.BARGHOUTY
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Shell Configuration
4/2/2014
2014 APS APRIL MEETING, SAVANNAH, GA 
M.S.SABRA & A.F.BARGHOUTY
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Slab Configuration
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2014 APS APRIL MEETING, SAVANNAH, GA 
M.S.SABRA & A.F.BARGHOUTY
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Slab Configuration
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2014 APS APRIL MEETING, SAVANNAH, GA 
M.S.SABRA & A.F.BARGHOUTY
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Remarks
Prediction of neutron energies in p+Al reaction 
using Geant4 Models Shielding, INCLXX and BIC are 
in good agreement
For alpha energy spectra, INCLXX shows better 
prediction than Shielding Model
For Fe+Al reaction, both INCLXX and Shielding 
agree in predicting neutrons protons.
MSFC will be hosting the 10th Geant4 Space User 
Workshop, May 27-29,2014
Acknowledgement
This work is supported by an 
appointment to the NASA Postdoctoral 
Program at Marshall Space Flight Center, 
administered y Oak Ridge Associated 
Universities through a contract with 
NASA
www.orau.org
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2014 APS APRIL MEETING, SAVANNAH, GA 
M.S.SABRA & A.F.BARGHOUTY
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Thank You!
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Geant4 Predictions of Energy Spectra in Typical Space Radiation Environment

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