Free
Activated automatically
- Every feature of the application
- Up to 50,000 primary particles per run
- Ideal for evaluating RadMap and building models
- No registration required
For Windows 10 and 11
Radiation physics,
on your desktop.
RadMap is a desktop application for radiation dose rate calculations. Model your environment, place radioactive sources and dose maps, and let a full Monte Carlo simulation compute dose rates with statistical uncertainties – using every core of your computer.
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What is RadMap?
Monte Carlo transport, without the scripting.
RadMap uses the radiation transport toolkit Geant4 behind a graphical interface, so you can calculate external dose to a person in a customised environment in minutes rather than days.
Full Monte Carlo transport
RadMap uses the Geant4 toolkit as its calculation engine and follows every particle through your geometry. Simulations are multi-threaded, so run time drops with every extra CPU core.
Shielding, scatter and skyshine
Shields attenuate and scatter, and so do the air and ground you model around them. RadMap follows every photon through all of it, with no separate mode for skyshine. Model the air above a shield, and RadMap counts the radiation the sky scatters back down to the ground. This is validated against the Kansas State University Co-60 skyshine experiment from SINBAD, the OECD/NEA shielding benchmark archive – see the V&V report.
3D geometry builder
Build your environment from nested boxes, tubes and spheres – with adjustable opening angles for shielding containers and shells. Position and rotate each solid in the 3D view, and save any part as a reusable volume for other projects.
Materials database
Choose from a wide selection of predefined materials from the NIST database. Define your own materials, elements and isotopes in the material editor, and import or export whole material libraries.
Radioactive sources
Attach a source to any solid and choose from a large number of radioactive isotopes. Give the activity in becquerels or curies – as a total, or per mass or volume of the solid. Optionally follow the full decay chain.
Dose quantities
Each dose map scores one of these quantities:
- Effective dose (Sv/h) – for an AP, PA, ROT, ISO, LLAT or RLAT body orientation
- Ambient dose equivalent H*(10) (Sv/h) – for area monitoring
- Air kerma (Gy/h) – for instrument calibration, such as ionisation chambers
RadMap scores the photon fluence and converts it to dose with coefficients from tables published by the ICRP and ICRU; every report lists the publications behind its numbers. Dose maps don’t disturb the transport and may overlap solids.
Bremsstrahlung from beta emitters
Optional electron transport follows the betas of high-energy emitters such as Sr-90/Y-90 or P-32 and scores the bremsstrahlung they produce in lead or tungsten shielding.
Results & PDF reports
Every dose map shows its dose rate with statistical uncertainty. Export a PDF report with the dose maps, sources, data sources and a picture of the 3D scene.
Verified and validated
Every release comes with a V&V report, generated from RadMap's tests. It shows each result next to its reference: published data, or measurements from shielding experiments. Projects shipped with RadMap let you check that your installation reproduces the released results. Both are in the documentation.
Workflow
From empty world to dose report in five steps.
Step 1 of 5
Build the environment
Model the environment as nested solids inside a world box. Every solid sits fully inside its parent, and volumes may not overlap.
- Shapes
- Boxes, tubes and spheres – tubes and spheres can be hollow or cut open with angles
- Placement
- Position and rotation relative to the parent solid
- Materials
- Predefined materials from the NIST database, or your own materials, elements and isotopes
- Reuse
- Save any part as a volume and load it into other projects
Step 2 of 5
Place sources
Make any solid radioactive by attaching a source to it.
- Isotopes
- Standard and exotic radioactive isotopes – from common calibration and industrial sources to rare nuclides
- Activity
- Total, or per mass or volume of the solid
- Units
- Becquerel (nBq – EBq) or curie (nCi – ECi)
- Decay chain
- Optionally follow the full chain of decay products
Step 3 of 5
Place dose maps
Place box-shaped dose maps where you need the dose rate. They score the photon fluence without disturbing the transport and may overlap solids.
- Effective dose
- Sv/h, for an AP, PA, ROT, ISO, LLAT or RLAT body orientation
- H*(10)
- Sv/h, for area monitoring and comparison with survey meters
- Air kerma
- Gy/h, for instrument calibration, such as ionisation chambers
Step 4 of 5
Simulate
Choose how many primary particles to simulate and start the run.
- Precision
- Ten times the particles gives about three times smaller uncertainty – run time grows linearly
- Free license
- Up to 50,000 primary particles per run
- Electrons
- Optional transport for bremsstrahlung from beta emitters behind high-Z shielding
- Speed
- Multi-threaded – the run uses every core of your computer
Step 5 of 5
Collect results
Each dose map shows its dose rate with its statistical uncertainty.
- PDF report
- Dose maps, sources, data sources and a picture of the 3D scene
- Traceability
- Every report lists the publications behind its numbers
- Project lock
- Inputs are locked while results are attached, so the two always match
Licensing
Up and running in minutes.
RadMap is currently free of charge. Install it and start calculating straight away – when you need more particles, request a free 30-day trial of the full license.
Full
Free 30-day trial on request
- No limit on primary particles
- Higher precision in the results
- Takes effect immediately – no restart
- Bound to your machine
Open Help → License in RadMap – your machine ID is copied to the clipboard. Send it to us, then install the .lic file you receive with Install License File….
FAQ
Frequently asked questions
Can't find your answer? Check the documentation, ask in our Discussions or get in touch.
What are the system requirements?
- OS
- Windows 10 (version 1803 or later) or Windows 11, 64-bit
- Disk
- About 1 GB free
- CPU
- Any modern processor – simulations use every core, so more cores mean shorter run times
- Graphics
- OpenGL 3.3 or later – any graphics card or integrated graphics from the last decade; some virtual machines and remote desktop sessions lack it
- Account
- Administrator rights to install
How do I verify the download?
Compare the installer's SHA-256 checksum with the one shown under the Download button, which is also in RadMap_setup.exe.sha256 on the release page. In PowerShell, in the folder you downloaded to, run Get-FileHash .\RadMap_setup.exe -Algorithm SHA256 – the Hash it prints must match. A matching checksum shows that the installer arrived complete and unaltered.
What does RadMap cost?
Nothing at the moment. The free license is activated automatically and has no time limit, and a full license without the particle limit is available as a free 30-day trial on request.
How do I get a full license?
Full licenses are currently offered as a free 30-day trial. In RadMap, open Help → License. The dialog shows your machine ID and copies it to the clipboard – send it to info@radmap.tech. When you receive your .lic file, open the same dialog, click Install License File… and select it. The license takes effect immediately, is tied to that machine and cannot be transferred. If it has an expiry date, the same dialog shows it; when it expires, RadMap returns to the free license.
How long does a simulation take?
It depends on how many primary particles your case needs, and on your computer. As a guide, a typical geometry with 106 primary particles (requires a full license) finishes in about 30 seconds on a standard laptop, with a statistical uncertainty of calculated dose rates below 5 %. Run time grows linearly with the number of particles and drops with every extra CPU core, since simulations are multi-threaded. Enabling electron transport also makes a run noticeably slower.
The number of particles needed depends on the case. Shielding between source and dose map, distance, and the size of the dose map all decide how many particles actually reach it – a heavily shielded or distant dose map may need many times more than one in direct view of the source. Increase the number of particles until the uncertainty reported with each dose rate is small enough for your purpose: ten times more particles takes ten times longer and reduces the uncertainty by roughly a factor of three.
Which dose quantities can RadMap calculate?
Effective dose in Sv/h – the whole-body quantity radiation protection limits are expressed in – for six body orientations: AP, PA, ROT, ISO, LLAT and RLAT. ROT is generally the most meaningful choice for a single source; with several sources at different angles, prefer ROT or ISO. Ambient dose equivalent H*(10) in Sv/h is the operational quantity for area monitoring – what survey meters are calibrated to show. Air kerma in Gy/h is the reference quantity for calibrating instruments such as ionisation chambers, and for comparison with figures quoted in air kerma.
Where do the conversion coefficients come from?
RadMap transports particles and scores the fluence averaged over each dose map's volume. That fluence is multiplied by coefficients from internationally agreed tables – RadMap applies them, it does not derive them. Effective dose uses ICRP 116 (photons from 10 keV to 10 GeV); H*(10) and air kerma use ICRP 74 (10 keV to 10 MeV). Dose → Dose settings shows the publication for each quantity, and every PDF report lists the publications its numbers are based on.
When should I enable electron transport?
Only when your source is a high-energy beta emitter, such as Sr-90/Y-90 or P-32, in or near high-Z shielding like lead or tungsten. The electrons are then stopped in the shield and radiate bremsstrahlung photons that can add substantially to the dose outside it. For most sources the photons carry all the dose of interest, so the option is off by default – it noticeably increases simulation time.
Can I reuse geometry between projects?
Yes. Right-click a solid and choose Save Volume to save it, with everything inside it, as a .sol file – optionally with its sources and dose maps, and always with the materials it uses. Load Volume inserts it into another project. Material libraries can also be exported and imported from the Materials menu.
Can I simulate metastable isotopes such as Tc-99m?
Not directly. Sources use the decay scheme of the ground-state nucleus, so Tc-99 does not give the dose rate of Tc-99m. Cs-137 does give the expected result, because it decays to the metastable Ba-137m.
Support
Get in touch.
Pick the channel that fits your question. Answers given in public help the next user too.
Discussions and issues are public – please never post confidential project data there.