For Engineers · Neutron Transport
Neutron Transport for a fallout plume
Built for engineers using it for real design work. Go from concept to a running model in the browser, then scale to the cloud when needed. Simulate a fallout plume live below — adjust the inputs and watch it respond, right in your browser.
Neutron TransportLive
random walk & moderation
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
Mean free path30 px
Escaped0 / 40
Leakage0%
Governing equation
Reading this result: A moderate mean free path balances moderation against leakage — enough scattering to thermalize neutrons, but geometry still governs whether the core goes critical.
Runs locally in your browser — free forever. Scale to the cloud when reality gets heavy.
Also for:StudentsResearchersEducatorsHobbyists & MakersK-12 StudentsFirst RespondersGeneral version →
More with Neutron Transport
Frequently asked questions
- Is this good for engineers?
- Yes — this version of "Neutron Transport for a fallout plume" is framed for engineers using it for real design work. Go from concept to a running model in the browser, then scale to the cloud when needed.
- Do I need to install anything?
- No. It runs in any modern browser, free, with no account required.