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geant4/examples/advanced/radioprotection/README
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Gabriele Cosmo 216a75eeb1 Import Geant4 8.1.0 source tree
2016-06-09 14:44:26 +02:00

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=========================================================
Geant4 - Radioprotection example
=========================================================
README
---------------------
0. INTRODUCTION
The Radioprotection example derives from a Geant4 application
( look www.ge.infn.it/geant4/space/remsim for more details ) whose 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 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.
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 user can select the physics processes to activate interactively as
shown in the macro vis.mac.
The example is provided of:
- Low Energy electromagnetic processes for photons, e-
- Standard electromagnetic processes for e+
- Low Energy electromagnetic processes with ICRU parameterisation
for p, alpha and ions
- Muon electromagnetic processes
- Decay
- Hadronic processes for p and alpha particles as primary particles.
The user can choose the Bertini cascade approach or the
binary cascade approach for the modeling of proton hadronic physics.
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
if ANALYSIS_USE = 1 in the variable environment, the output of
the simulation is remsim.hbk or remsim.xml.
The default output file is remsim.hbk.
The user can change the format of the output file interactively as shown
in section 5.1
The file contains histograms:
- 10 (1) Energy Deposit (MeV)in the phantom (astronaut) versus
the depth along Z axis
- 20 (1) Initial energy per nucleon (MeV) of primary particles
- 30 (1) Energy Deposit (MeV) in the phantom given by secondaries
versus the depth along Z axis
- 40 (1) Initial energy (MeV) of primaries reaching the phantom
- 50 (1) Initial energy (MeV) of primaries ougoing the phantom
- 60 (1) Energy (MeV) of primaries reaching the phantom
- 70 (1) Energy (MeV) of primaries outgoing the phantom
- 80 (2) Project the coordinate of the hits on the plane xy
- 90 (2) Project the energy deposit of the hits on the plane xy
- 100 (1) Secondary particles produced in the phantom
- 110 (1) Energy of secondary p produced in the phantom
- 120 (1) Energy of secondary n produced in the phantom
- 130 (1) Energy of secondary pions produced in the phantom
- 140 (1) Energy of secondary alpha produced in the phantom
- 150 (1) Energy of secondary e+ produced in the phantom
- 160 (1) Energy of secondary e- produced in the phantom
- 170 (1) Energy of secondary gamma produced in the phantom
- 180 (1) Energy of secondary mu produced in the phantom
- 190 (1) Energy of secondary other particles produced in the phantom
- 200 (1) Phantom Slice where secondary protons are produced
- 210 (1) Phantom Slice where secondary neutrons are produced
- 220 (1) Phantom Slice where secondary pions are produced
- 230 (1) Phantom Slice where secondary alpha are produced
- 240 (1) Phantom Slice where secondary positrons are produced
- 250 (1) Phantom Slice where secondary electrons are produced
- 260 (1) Phantom Slice where secondary gamma are produced
- 270 (1) Phantom Slice where secondary muons are produced
- 280 (1) Phantom Slice where secondary other particles are produced
- 300 (1) secondary particles reaching the phantom
- 310 (1) Energy of secondary p reaching the phantom
- 320 (1) Energy of secondary n reaching the phantom
- 330 (1) Energy of secondary pions reaching in the phantom
- 340 (1) Energy of secondary alpha reaching the phantom
- 350 (1) Energy of secondary e+ reaching the phantom
- 360 (1) Energy of secondary e- reaching the phantom
- 370 (1) Energy of secondary gamma reaching the phantom
- 380 (1) Energy of secondary mu reaching the phantom
- 390 (1) Energy of secondary other particles reaching the phantom
- 400 (1) Energy of secondary neutrinos produced in the phantom
- 500 (1) secondary particles in the vehicle
6.SET-UP
- a standard Geant4 example GNUmakefile is provided
setup with:
compiler = gcc-3.2.3
G4SYSTEM = linux-g++
The following environment variables need to be set for the physics packages:
G4LEDATA points to low energy data base - G4EMLOW3.0
G4LEVELGAMMADATA points to PhotoEvaporation data
G4RADIOACTIVEDATA points to Radioactive Decay data
NeutronHPCrossSections points to neutron data - G4NDL3.7
Setup for analysis: AIDA 3.2.1, PI 1.3.8
Users can download the analysis tools from:
http://aida.freehep.org/
http://www.cern.ch/PI
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:
$G4WORDIR/bin/Linux-g++/remsim vehicle1.mac
$G4WORDIR/bin/Linux-g++/remsim vehicle2.mac
$G4WORDIR/bin/Linux-g++/Brachy moon.mac
- Interative mode:
$G4WORDIR/bin/Linux-g++/remsim
-> the vis.mac is loaded automatically
------------------------------------------------------------------------
Author : Susanna Guatelli
for comments, advices, doubts and questions: guatelli@ge.infn.it
last modified: Susanna Guatelli 31/5/2006
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