Neutron Transport for a criticality test
Simulate a criticality test live in your browser. This runs the real Neutron Transport solver — adjust the inputs, watch it respond instantly, and export the result. No install, no account.
Controls
Presets
Neutrons do not travel straight — they random-walk through matter, scattering every mean free path and losing energy at each collision. This moderation slows fast neutrons to thermal speeds where they fission efficiently. A short mean free path (dense material) keeps them inside; a long one lets them leak out, which is why reactor size and geometry set criticality.
Data Inspector
Governing equation
Runs locally in your browser — free forever. Scale to the cloud when reality gets heavy.
About this simulation
The full Neutron Transport tool models a criticality test with the same numerics engineers and scientists use — running entirely client-side. Change any parameter and the result updates in real time, so you can build intuition, check a design, or teach the concept without spreadsheets or installs.
More you can do with Neutron Transport
Other ways to simulate a criticality test
Frequently asked questions
- How do I simulate a criticality test?
- Open this page and use the live Neutron Transport tool below — set your inputs and the simulation runs instantly in your browser using real numerics. No install, no account needed.
- Is it free?
- Yes. The simulation runs free in your browser. A one-time unlock or a Pro plan adds advanced parameters, saved presets, data import, and clean exports.
- Can I use my own numbers?
- Absolutely — every input is adjustable, and with data import you can drive a criticality test from your own measurements.