Radioactive
by Cosmos19
Radioactive is a NeoForge technology mod for 1.21.8 that adds radioactive materials, a radioactive biome and a hazmat armour set to the game.
What it does
Radioactive materials are the core of the mod: several kinds of radioactive ore, stone and other items join the world, each carrying a radioactivity value that a player can carry, store or work with. Dedicated blocks and items let a player handle these materials, and a radioactivity system applies effects to the player when exposure builds up.
A dedicated radioactive biome generates in the world with its own custom trees and atmosphere, so exploring the mod means encountering a different landscape alongside the new materials. A hazmat armour set is available to reduce the effects of exposure, giving players a protective option while they explore the biome.
Nuclear reactors are listed as work in progress by the author, so they are not part of the current release. The mod runs on client and server, and the server and every player both need it. Files are published for NeoForge only, for 1.21.8, and the license is All rights reserved, so the code is not open source.
Key features
Radioactive materials
Several radioactive ores, stones and other items add new resources to gather and craft with.
Radioactivity effects
Exposure to radioactive items builds a level that applies effects to the player over time.
Hazmat armour set
A set of protective armour pieces is available to reduce the effects of radioactivity while exploring.
Radioactive biome
A biome with custom trees and its own atmosphere generates in the world as an exploration area.
Gallery
Compatibility
Latest build for each game version and loader.
Only full game releases are shown. This mod publishes no snapshot builds.
Use cases
Exploring the biome
Players can travel to the radioactive biome, gather its materials and use the hazmat armour while they work there.
Adventure maps
Map makers can place the biome and its materials in adventure content that centers on hazardous terrain.
Who it’s for: The mod suits players who want radioactive materials, a hazardous biome and protective gear in a NeoForge world. Server owners who run 1.21.8 need to install it on the server and on every player's client.
How it compares
The Wasteland is a NeoForge mod for 1.21.1 under the MIT License, also client and server and not open source, so it targets a different version. Project: Nuclei is a NeoForge mod for 1.21.1 that is licensed as All rights reserved, while Radiation Poisoning is a NeoForge mod for 1.21.8 under the same All rights reserved license.
| Mod | Loaders | Game versions | Environment | Updated |
|---|---|---|---|---|
| Radioactive | NeoForge | 1.21.8 | Client and server | 2026-02-25 |
| The Wasteland | NeoForge | 1.21.1 | Client and server | 2026-06-24 |
| Project: Nuclei | NeoForge | 1.21.1 | Client and server | 2026-06-17 |
| Radiation Poisoning | NeoForge | 1.21.8 | Client and server | 2026-07-24 |
Questions
Does Radioactive need a loader other than NeoForge?
Do servers need Radioactive installed?
Are nuclear reactors in the mod?
In the catalog
Radioactive is one of 8,499 Technology mods on ModsFinder, and one of 3,557 Technology mods for NeoForge. 17,695 mods support Minecraft 1.21.8.
More from Cosmos19
Similar mods
Official listing
- Modrinth page
- modrinth.com/mod/radioactive-was-taken
- Owner
- Cosmos19
- Published
- 2026-02-14
- Updated on Modrinth
- 2026-02-25
- Facts verified
- 2026-10-15