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Mekanism: Neutron Activator

by michanide

Mekanism: Neutron Activator adds a machine that produces neutron, a process needed to turn radioactive waste into D-T fuel for fusion reactors.

ForgeNeoForgeClient and serverMIT License1.18.2 – 1.21.1

What it does

The addon adds a machine to the Mekanism processing chain that activates neutron production. The technology uses neutron beams from a neutron source, and the output is needed to process radioactive waste into D-T fuel. The mod depends on Mekanism and Mekanism Generators, so both must be installed alongside it.

The addon was built as an alternative to the sun-driven neutron beam method, which stops working in environments where the sun is unavailable and is affected by weather and climate. It also covers the case where a lead shutdown of fusion reactors leaks radioactive waste. The new method draws neutrons from a fusion reaction instead, so it works regardless of weather or climate. A second method runs on nuclear waste as its input.

The mod runs on Forge and NeoForge and is published for 1.18.2, 1.20.1 and 1.21.1. The license is MIT, and the project is not open source. Environment is client and server, so the server and every player need it.

Key features

  1. Neutron activation machine

    A machine that activates neutron production inside the Mekanism processing chain, feeding the radioactive waste to D-T fuel step.

  2. Fusion-based neutron source

    A neutron source that draws on a fusion reaction, giving a steady supply regardless of the time of day.

  3. Waste-driven method

    A second activation route that takes nuclear waste as its input instead of relying on a sun-driven beam.

  4. Machines for the Mekanism chain

    Each new machine plugs into the existing Mekanism processing and power setup, using Mekanism Generators for energy.

Compatibility

Latest build for each game version and loader.

1.21.1Not available1.21.1-1.0.0
1.20.11.20.1-1.3.0Not available
1.18.21.2.3Not available
ReleaseBetaAlphaNot available

Only full game releases are shown. This mod publishes no snapshot builds.

Requirements

Dependencies declared by the latest file for each loader.

Required 2

MekanismHigh-tech machinery, powerful energy generation, fancy gadgets and more. Now on Modrinth!
Required
Mekanism GeneratorsAdvanced energy generation for Mekanism.
Required

Use cases

Who it’s for: Players who run Mekanism fusion reactors on a server or in a single-player world and need a reliable neutron supply for D-T fuel. Server owners who want a weather-independent option for waste processing can add it alongside Mekanism.

Questions

Which loaders does this addon support?

It is published for Forge and NeoForge. Files exist for 1.20.1 and 1.21.1 on those loaders, and 1.18.2 has a build as well.

Does this addon need Mekanism Generators?

Yes. Mekanism and Mekanism Generators are both required dependencies, and the mod is not usable without them.

Does this addon have to be installed on the server?

Yes. Every player and the server need a copy of the mod.

What the author says

Mekanism has processing technology which uses neutron. This technology is necessary for processing radioactive waste and producing D-T fuel. Currently practical method uses neutron beams from the sun. This method has the weakness of being weather and climate dependent. This weakness can lead to the shutdown of fusion…
michanide, on the Modrinth page

Official listing

Owner
michanide
Published
2025-08-14
Updated on Modrinth
2026-05-15
Facts verified
2026-10-15
Open on ModrinthCompare