For First Responders · Fission Chain Reaction
Fission Chain Reaction for a Geiger counter
Built for first responders planning or training for real incidents. Run fast what-if scenarios for response planning and training — no software to install in the field. Simulate a Geiger counter live below — adjust the inputs and watch it respond, right in your browser.
Fission Chain ReactionLive
the multiplication factor k
Controls
Presets
Each fission releases neutrons that can trigger more fissions. The multiplication factor k is how many of those neutrons cause a new fission on average. Below 1 the chain dies out; exactly 1 sustains steady power — a running reactor; above 1 it grows exponentially. Control rods nudge k around 1 to hold a reactor critical.
Data Inspector
k factor1.000
Generation0
Statecritical (steady)
Governing equation
Reading this result: k is essentially 1: on average one neutron per fission triggers the next, a self-sustaining steady chain — a running reactor.
Runs locally in your browser — free forever. Scale to the cloud when reality gets heavy.
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Frequently asked questions
- Is this good for first responders?
- Yes — this version of "Fission Chain Reaction for a Geiger counter" is framed for first responders planning or training for real incidents. Run fast what-if scenarios for response planning and training — no software to install in the field.
- Do I need to install anything?
- No. It runs in any modern browser, free, with no account required.