What are the IT requirements for running FASTRAD®?

FASTRAD® runs on Windows system (Vista, Seven, 8 and 10), 32 and 64 bits OS. It runs also on Linux or MacOs thanks to a Windows emulator (Wmware, etc.).

Minimum requirement:
Operating System : Windows Vista/7/8/10
CPU Type : 2Ghz 32-bit(x86) or 64-bit(x64)
Memory : 512 Mb
Graphic card : integrated or dedicated gpu compliant with OpenGL 2.1
Disk space : 150 Mb

Optimal requirement:
Operating System : Windows Vista/7/8/10
CPU Type : 3Ghz 64-bit(x64) 8 threads
Memory : 8Gb
Graphic card : dedicated gpu compliant with OpenGL 2.1 and with 1Gb memory
Disk space : 1 Gb
Disk type : SSD

What is the license policy?

The FASTRAD® license is a node-locked one. A FASTRAD® license can be used on multiple PCs through the use of a USB key holder / dongle (one session at a time).

What is the duration of the license?

The distribution is based on an annual license leasing. Multi-year leasing is available. Please contact fastrad@trad.fr for a quotation request.

How many FASTRAD® users can work with the same license?

The number of people using the same license is not limited. The software can be installed on multiple computers, however only the dongle / USB key holder can run it. One FASTRAD® license can be shared between several users, but only one can use it at a time.

Do I really need to take the 1 day training?

The 1-day training is strongly recommended. It can be conducted at user’s premises or at TRAD. The training gives an overview of the radiation analysis performed thanks to FASTRAD®. It proposes an in-depth view of the capabilities in terms of radiation oriented 3D modeling, calculation and post-processing. The trainer (a radiation engineer) is able to adapt the content to match specific customer needs.


What are the features of the TRIAL version? Why is it interesting to download it?

FASTRAD®’s trial version gives access to a part of the 3D modeler and viewer in order to initiate the user to the radiation model building into FASTRAD®: simple shapes insertion, cut operation, geometrical transformations, materials setting, model hierarchy handling. The user is also able to import STEP files and to export models in GDML format (for GEANT4 calculation) with some limitations on the number of translated shapes.

We strongly recommend to use the advanced GDML export module available in the Bronze license package.

What are the languages available for the interface?

FASTRAD® interface is available in English, Russian, Chinese and French.

I need to calculate the dose received by my device and to design radiation shielding

FASTRAD® allows performing this task using its 3D modeling interface, then its dose calculation engine based on the ray-tracing approach, and its post processing feature that indicates the best location for radiation shielding on your 3D model. For more info, please browse the module page.


I’m a GEANT4 user and I want a User Interface to create my project

The FASTRAD® GEANT4 module offers a user friendly interface to define and create a GEANT4 project. The user is able to import STEP geometry, to set the material properties, to define the source characteristics, the physics list and the type of analysis needed. The Bronze package includes this dedicated module (see the modules page).

What STEP or IGES format are available? Is there a limitation on the size of the imported files?

FASTRAD® is able to read STEP files with protocols Ap209, Ap214 and IGES files v5.0. The size limitation depends on the complexity of the geometrical model included in the file. FASTRAD® converts all the surfaces described in the file in a triangular mesh. The RAM needed for the shape import depends on the surfaces complexity and the discretization value.

What are the limitations in terms of shapes, detectors or material number in the commercial version?

No limitation on the commercial versions: Bronze, Silver and Gold.

How many component package models are available?

FASTRAD® offers more than 40 models for active components (DIL, DO, Flatpack, TO, TSOP, etc) and passive components (Capacitor, connector, resistor, etc.).

Is there 64 bits version available?

The x86 version is compatible with x64 machine, and the RAM capabilities have been extended to 4Gb (only for x64 system).

What type of particles can be considered?

The sector analysis method uses a dose depth curve to define the isotropic radiation environment. This dose depth curve is an input of your FASTRAD® analysis, and includes all the particles needed. For non isotropic environment, the user has to use a Monte Carlo approach. FASTRAD® offers a Monte Carlo calculation engine for the energy deposition due to an incident electron, proton and photon flux. This calculation includes the creation of secondary electrons and photons.


Does FASTRAD® offer distributed processing?

Yes, the Monte Carlo calculation (reverse and forward) allows multi-thread calculation limited to the number of threads available on the user machine.


Is FASTRAD® able to simulate nuclear source with gamma decay?

FASTRAD® is dedicated to the simulation of space environment. It does not allow defining radioactive sources. If you are interesting in this capability, have a look at our software solution for decay simulation: www.rayxpert.com. Please contact rayxpert@trad.fr for a quotation request.


What are the Forward and Reverse Monte Carlo capabilities?

Forward Monte Carlo

The forward Monte Carlo algorithm allows tracking particles in matter. The particles taken into account are:

  • Electrons (primaries and secondaries),
  • Photons (primaries and secondaries),
  • Positrons (only secondaries),
  • Protons (primaries).

The different physical processes implemented are:

For Electrons:

  • Bremsstrahlung (1 keV – 1 TeV),
  • Ionization (1 keV – 1 TeV),
  • Multiple Scattering (1 keV – 1 TeV).

For Photons:

  • Compton scattering (1 keV – 100 GeV),
  • Photo-electric effect (1 keV – 100 GeV),
  • Pair production (1.022 MeV – 100 GeV).

For positrons:

  • Bremsstrahlung (1 keV – 1 TeV),
  • Annihilation (1.022 MeV – 100 GeV),
  • Ionization (1 keV – 1 TeV),
  • Multiple Scattering (1 keV – 1 TeV).

For protons:

  • Ionization (1 keV – 1 TeV),
  • Multiple Scattering (1 keV – 1 TeV).      

Reverse Monte Carlo

The Reverse Monte Carlo algorithm allows to backtrack particles in matter from the sensitive volume or the detector to the outer space. The particles taken into account are:

  • Electrons (primaries and secondaries),
  • Photons (secondaries),
  • Protons (primaries).

The different physical processes implemented are:

For Electrons:

  • Bremsstrahlung (1 keV – 1 TeV),
  • Ionization (1 keV – 1 TeV),
  • Multiple Scattering (1 keV – 1 TeV).

For Photons:

  • Compton scattering (1 keV – 100 GeV),
  • Photo-electric effect (1 keV – 100 GeV).

For Protons:

  • Ionization (1 keV – 1 TeV),
  • Multiple Scattering (1 keV – 1 TeV).

During the Reverse particle tracking the Bremsstrahlung and the Ionization processes are used to create particles.

The Reverse MC calculation allows to calculate both Total Ionizing Dose and Total Non-Ionizing Dose for the materials assigned to the punctual or volume detectors.

How to consider result differences between sector analysis and Monte Carlo calculation methods? Which one should I use for my calculation?

Sector analysis and Monte Carlo calculations are based on two different approaches:

  • Sector analysis converts all materials into Aluminum and uses a dose depth curve as the environment input. This dose depth curve is specific to a shielding and a target material, usually Aluminum and Silicon.
  • Monte Carlo considers the actual interactions between particles and matter. The materials do not have to be converted into Aluminum. The electron or proton flux is used as the environment input. The target material can be made of Silicon or any other material depending on the Monte Carlo calculation method.

In summary, sector analysis gives an estimation of the dose for a fast calculation (few seconds) but converting materials into Aluminum and using a specific dose depth curve lead to an important information loss. On the contrary, the Monte Carlo calculation takes into account the actual shielding materials and their properties; however the computing time is longer.

Can I use FASTRAD® for TNID calculation?

As for TID, FASTRAD® can be used for TNID calculation both through the Reverse MC module and also thanks to the ray-tracing method by entering equivalent fluence depth curve. The same FASTRAD® model (built-in or step imported) is used for TID and TNID calculation. The TNID calculated by Reverse MC can be post-processed thanks to the NIEL table in order to get equivalent fluence for the specified particle and energy.


Can I use Fastrad® for SEE rate calculation?

FASTRAD® is a tool dedicated to total dose calculation (TID and TNID). The SEE rate can not be calculated with FASTRAD®.However, a FASTRAD® sector file (sectorized geometry) can be used to compute an SEE rate with the OMERE software.

What kind of post-processing is available in FASTRAD®?

Different post-processing levels are available within FASTRAD®:

 The dose

The dose results may be displayed in the viewer on the 3D interactive model depending on the detector chosen in the interactive list of the doses

The sector analysis results

The Aluminum crossed thicknesses may be displayed in the 3D geometric model. They may be represented as rays, projection on a sphere or on a box. The rays and mapping are displayed in function of a selected range of thicknesses or a part of the received dose. This box can be defined as representative of a specific part of your model (a unit for example). This last capability may be of particular interest when performing a radiation analysis.

The Monte Carlo particle tracking

All the particle tracks are displayed in the 3D geometric model. The user has access to a large quantity of information for each particle step. It includes its type, energy, energy loss, occurring physical process, position and many others. These data are also available through a text file listing all the interactions and particle steps during the whole calculation.

As this option produces a huge amount of data, it may be interesting to use it as a debugging tool only tracking a limited number of particles.

The Monte Carlo 3D mapping

Dedicated interfaces allow to define sensitive zones and to visualize 3D mapping of the doses, energies and fluences collected in these zones during the Forward and Reverse calculation. It proposes three different visual metaphors to display the information (3D texture, 2D color planes and voxels) and gives the opportunity to filter, clip, and interact with the results in order to highlight the hot paths and critical areas.

Why should I use FASTRAD® for a ray-tracing calculation when I can simply estimate the TID level with the dose depth curve?

The spherical dose depth curve assumes an isotropic shielding distribution, which is not the case in the real system geometry. That is the reason why a detailed radiation model is designed in order to perform the sector analysis with the dose depth curve.

Why is it important to take into account the shielding provided by the part package?

The part package can bring a significant shielding as it covers the 4-pi space surrounding the silicon die, and it may be manufactured in materials as heavy as metals or ceramics. FASTRAD® proposes a non-exhaustive device package database that can be adapted by users for modelling.