🔬 RadDetect AI — Geant4 & Allpix^2 MCP Server

AI-powered radiation detector simulation through natural language.

A single-file Model Context Protocol (MCP) server that connects Allpix^2 and Geant4 Monte Carlo simulation with Claude AI. Design, configure, run, and analyze pixelated radiation detector simulations by talking to Claude — no manual config writing needed.

Built by Rad Detect AI for the radiation detection and medical imaging community.

What It Does

You talk to Claude. Claude calls the MCP tools. Allpix^2 runs your simulation.

You:    "Simulate a 2mm CdZnTe detector, 110µm pitch, 20µm gap, -800V, 60 keV gammas, 5000 events"

Claude: → calls geant4_generate_allpix2_config
        → writes main.conf + detector model + geometry
        → runs: allpix -c main.conf
        → returns ROOT output with 5M+ objects

9 Tools

| # | Tool | What it does | |---|------|--------------| | 1 | geant4_generate_macro | Generate Geant4 macro files (.mac) with geometry, physics, scoring | | 2 | geant4_generate_allpix2_config | Create complete Allpix^2 configs for pixel detector simulation | | 3 | geant4_run_simulation | Execute Allpix^2 or Geant4 simulations | | 4 | geant4_analyze_results | Analyze output — energy spectra, spatial maps, charge sharing | | 5 | geant4_material_lookup | Detector material database (CdZnTe, CdTe, Si, Ge, CsI, BGO, LYSO, GaAs) | | 6 | geant4_generate_xray_spectrum | Polyenergetic X-ray spectrum generation (W, Mo, Rh anodes) | | 7 | geant4_list_files | Browse workspace files | | 8 | geant4_physics_calculator | Hecht equation, Fano resolution, charge sharing, attenuation | | 9 | geant4_workspace_status | Check environment and available simulators |

Quick Start

Prerequisites

Python 3.10+
Allpix^2 (with Geant4)
Claude Code or Claude Desktop

Install (3 commands)

mkdir -p ~/geant4-mcp-server && cd ~/geant4-mcp-server
python3 -m venv .venv && source .venv/bin/activate
pip install "mcp[cli]" pydantic httpx numpy uproot matplotlib scipy

Copy geant4_mcp_server.py into ~/geant4-mcp-server/.

Verify:

python3 -c "from geant4_mcp_server import mcp; print('✅ Server OK:', mcp.name)"

Connect to Claude Code

claude mcp add geant4-simulation -- ~/geant4-mcp-server/.venv/bin/python3 ~/geant4-mcp-server/geant4_mcp_server.py

Start Claude Code and type /mcp — you should see 9 tools from geant4-simulation.

Connect to Claude Desktop

Create ~/.config/Claude/claude_desktop_config.json:

{
  "mcpServers": {
    "geant4-simulation": {
      "command": "/home/YOUR_USER/geant4-mcp-server/.venv/bin/python3",
      "args": ["/home/YOUR_USER/geant4-mcp-server/geant4_mcp_server.py"],
      "env": {
        "GEANT4_MCP_WORKSPACE": "/home/YOUR_USER/geant4_mcp_workspace",
        "GEANT4_INSTALL_DIR": "/opt/geant4"
      }
    }
  }
}

Restart Claude Desktop.

Example Conversations

Simulate a CdZnTe photon-counting detector:

Generate an Allpix^2 config for a 2mm thick CdZnTe detector with 110µm pixel pitch and 20µm interpixel gap, biased at -800V. Simulate 60 keV gammas, 5000 events.

Look up material properties:

Compare the µτ products and Fano factors of CdZnTe vs CdTe vs Silicon.

Calculate detector performance:

What's the Fano-limited energy resolution of CdZnTe at 140 keV with 80 electrons of electronic noise?

Generate an X-ray spectrum:

Generate a 120 kVp tungsten anode spectrum with 2.5mm Al filtration for CT simulation.

Materials Database

Built-in properties for 9 detector materials:

| Material | Type | Z_eff | Density (g/cm³) | |----------|------|-------|-----------------| | CdZnTe | Semiconductor | 49.1 | 5.78 | | CdTe | Semiconductor | 50.0 | 5.85 | | Si | Semiconductor | 14 | 2.33 | | Ge | Semiconductor | 32 | 5.32 | | GaAs | Semiconductor | 32 | 5.32 | | CsI:Tl | Scintillator | 54 | 4.51 | | CsI:Na | Scintillator | 54 | 4.51 | | BGO | Scintillator | 73 | 7.13 | | LYSO | Scintillator | 65 | 7.10 |

Includes mobility, µτ products, Fano factors, bandgap, pair creation energy, light yield, and more.

Physics Calculators

Hecht equation — Charge collection efficiency vs bias voltage and thickness
Fano-limited energy resolution — Fundamental resolution with electronic noise
Charge sharing estimation — Diffusion-based interpixel charge sharing fraction
Attenuation length — Photon mean free path in detector material

Tested With

Ubuntu 22.04 / 24.04 LTS
Allpix^2 v3.0.0
Geant4 11.2.2
Python 3.11
Claude Code v2.1

Roadmap

[x] Allpix^2 config generation + execution
[x] Material database (9 materials)
[x] Physics calculators (Hecht, Fano, charge sharing)
[x] X-ray spectrum generator
[ ] ROOT file analysis with uproot
[ ] GATE integration for medical imaging
[ ] GDML geometry import/export
[ ] RadDetect AI Academy integration
[ ] MTF / NPS / DQE calculation tools

Author

Elmaddin Guliyev, Ph.D. Founder, Rad Detect AI

Expertise: CdZnTe/CdTe photon-counting detectors, charge transport simulation, X-ray imaging systems, Monte Carlo (Geant4, Allpix^2).

License

MIT License

MCP Servers