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$Id: README,v 1.24 2007-06-06 19:15:06 pia Exp $
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Geant4 - Radioprotection example
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README
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Author: S. Guatelli, susanna@uow.edu.au
0. INTRODUCTION
The Radioprotection example scope is to evaluate the dose in astronauts,
in vehicle concepts and Moon surface habitat configurations, in a
defined interplanetary space radiation environment.
1. GEOMETRY
The user can calculate the dose in the astronaut (phantom) in the
following set-ups:
- Vehicle configuration
| ||sh| | | | |
|S||ie| |SPE | | |
----> |I||ld| |she | |phantom|
beam |H||in| |lter| | |
| ||g | | | | |
--------------------------------------->
Z axis
- The SIH is the Simplified Inflatable Habitat.
- The shielding is a layer of water, its scope it to protect the astronaut
from Galactic Cosmic Rays (GCR). The user can add, delete this element
in the geometrical configuration, change its thickness through UI comands.
- The SPE shelter is a water layer (thickness = 75.cm along Z axis), its scope
it to protect the astronaut from Solar Particle Events (SPE).
The user can add, delete this element in the geometrical configuration
through UI comands.
- The phantom is the astronaut model; the energy deposit is collected in this
geometrical component. The phantom is a box of water,
it is 30. cm wide along Z axis, it is voxelised in 30 slices along Z axis.
The energy deposit of primary and secondary particles is collected in
each voxel.
- Moon Habitat configuration
_______________________________
| |
/ |Moon Surface |
/ | |
| x | _________ |
|<->|| _____ | |
---->| || |Phan | | <---shelter |
beam | || |thom | | |
| || |_____| | |
\ ||_________| |
\ | |
pyramid |
log| |
|______________________________|
------------------------------------------->
Z axis
- The astronaut/phantom is set in the astronaut habitat (shelter).
- The pyramid log is made of moon soil and protects the astronaut from
GCR and SPE. The user can add, delete this element in the geometrical
configuration, change its thickness (x) through UI comands.
- The astronaut is the phantom. A scoring mesh has been set on top of the astronaut,
to calculate the energy deposition.
The astronaut is sliced along the Z axis in 30 slices. The energy deposition is integrated
over the run and is saved in a output ASCII file.
1.1 UI
- The user can change the geometry set-up with the following UI commands:
/configuration/choose vehicle -> choose the Vehicle configuration
/configuration/choose moon -> choose the Moon Habitat configuration
The user can not switch between these two configurations interactively.
- The user can select in the vehicle configuration:
/configuration/AddShielding On -> set the shielding water layer
/configuration/AddShielding Off -> destroy the shielding water layer
/shielding/thickness 30.cm -> set the thickness of the shielding layer
/configuration/AddSPE On -> set the SPE shelter
/configuration/AddSPE Off -> destroy the SPE shelter
- The user can select in the Moon surface habitat configuration:
/configuration/AddRoof On -> set the pyramid log
/configuration/AddRoof Off -> destroy the pyramid log
/roof/thickness 1. m -> set the height (x) of the pyramid log
2. PHYSICS LIST
The electromagnetic physics and decay are activated by default in the physics
list class. The user can activate the hadronic physics component interactively.
The macro to define the hadronic physics is physics.mac and it is executed by default, in the macros
vehicle1.mac, vehicle2.mac, moon.mac and interactive.mac
The threshold of production of secondary particles is fixed equal to 0.1 mm.
3. PRIMARY PARTICLES
Primary particles are generated according spectra derived from the
differential flux (CREME 96).
gcr_min_z=1.txt and gcr_min_z=2.txt contain the differential flux
of galactic cosmic protons and alpha particles with respect to the
energy (MeV/nucl).
These files are read by the primary particle component of the application
and the spectra are derived.
Primary particles are generated from a point set in
the position (0., 0., -25. m), with a direction (0., 0., 1.) by default.
The user can change these parameters interactively.
4. STEPPING
Available UI command:
/step/hadronicVerbose On -> print the hadronic processes undertaken by
particles during the run
/step/hadronicVerbose Off -> switch off the verbose level
5. ANALYSIS
The output file is remsim.root. It contains 1D histograms with the energy spectra of
- secondary particles of interest generated in the vehicle/planetary shelter and
reaching the astronaut,
- secondary particles of interest generated in the astronaut.
The ROOT file is created at the beginning of the run and is closed at the end of the run.
The histograms are instantiated in the RemSimRunAction class and are filled in the RemSimSteppingAction
class. The macro macro.C is provided as example to open the remsim.root file and to plot an histogram,
generated in the simulation.
6.SET-UP
- a standard Geant4 example GNUmakefile is provided
7. HOW TO RUN THE EXAMPLE
example macros are provided:
- vehicle1.mac, vehicle2.mac are examples of simulation in the
vehicle configuration
- moon.mac is an example of simulation in the Moon habitat configuration
- Batch mode:
1) $G4WORDIR/bin/Linux-g++/remsim vehicle1.mac
---> output files: remsim.root (analysis of secondary particles) and
EnergyDeposition_vehicle1.out (energy deposition in the phantom modelling the astronaut)
2) $G4WORDIR/bin/Linux-g++/remsim vehicle2.mac,
---> output files: remsim.root (analysis of secondary particles) and
EnergyDeposition_vehicle2.out (energy deposition in the phantom modelling the astronaut)
3) $G4WORDIR/bin/Linux-g++/remsim moon.mac,
---> output files: remsim.root (analysis of secondary particles) and
EnergyDeposition_moon.out (energy deposition in the phantom modelling the astronaut)
- Interative mode:
$G4WORDIR/bin/Linux-g++/remsim
---> the interactive.mac is executed automatically
---> outputfile: remsim.root (analysis of secondary particles) and
EnergyDeposition.out (energy deposition in the phantom modelling the astronaut)
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Gabriele Cosmo