# Uranium 238

Pyanodons item · internal name `u-238` · stack size 100 · first craftable in tier 4 (pY science pack 2, [tier 4](https://factorio.kalzumeus.com/tier/4.md))
HTML page: https://factorio.kalzumeus.com/item/u-238/

## Produced by (11 recipes)

### Uranium 238 (`Depleted-uf6-to-u-oxide`)

- 2 s · tier 6
- Ingredients: 40 × [Uranium hexafluoride](https://factorio.kalzumeus.com/fluid/uf6.md) (≤10°C)
- Results: 40 × [Uranium 238](https://factorio.kalzumeus.com/item/u-238.md)
- Made in: Evaporator MK 01, Evaporator MK 01 (Legacy), Evaporator MK 02, Evaporator MK 02 (Legacy), Evaporator MK 03, Evaporator MK 03 (Legacy), Evaporator MK 04, Evaporator MK 04 (Legacy)
- Unlocked by: [Uranium processing - Stage 1](https://factorio.kalzumeus.com/tech/uranium-mk01.md)

### Uranium 238 (`uranium-seperation`)

- 20 s · tier 7
- Ingredients: 10 × [Uranium Oxide](https://factorio.kalzumeus.com/item/uranium-oxide.md)
- Results: 0.1 × [Uranium 232](https://factorio.kalzumeus.com/item/u-232.md) (1% chance of 10), 0.1 × [Uranium 233](https://factorio.kalzumeus.com/item/u-233.md) (1% chance of 10), 0.25 × [Uranium 234](https://factorio.kalzumeus.com/item/u-234.md) (2.5% chance of 10), 1 × [Uranium 235](https://factorio.kalzumeus.com/item/u-235.md) (10% chance of 10), 0.8 × [Uranium 236](https://factorio.kalzumeus.com/item/u-236.md) (8% chance of 10), 1 × [Uranium 237](https://factorio.kalzumeus.com/item/u-237.md) (10% chance of 10), 6.75 × [Uranium 238](https://factorio.kalzumeus.com/item/u-238.md) (67.5% chance of 10)
- Made in: Particle accelerator MK 01, Particle accelerator MK 02, Particle accelerator MK 03, Particle accelerator MK 04
- Unlocked by: [Nuclear Power - Stage 2](https://factorio.kalzumeus.com/tech/nuclear-power-mk02.md)

### Uranium 238 (`nuclear-fuel-reprocessing-mk02`)

- 100 s · tier ?
- Ingredients: 5 × [Used up uranium fuel cell MK 02](https://factorio.kalzumeus.com/item/used-up-uranium-fuel-cell-mk02.md)
- Results: 3 × [Uranium 238](https://factorio.kalzumeus.com/item/u-238.md), 1 × [Uranium 235](https://factorio.kalzumeus.com/item/u-235.md)
- Made in: Centrifuge, Centrifuge MK 01, Centrifuge MK 02, Centrifuge MK 03, Centrifuge MK 04
- Unlocked by an upgrade choice (script), not research

### Uranium 238 (`nuclear-fuel-reprocessing-mk03`)

- 100 s · tier ?
- Ingredients: 5 × [Used up uranium fuel cell MK 03](https://factorio.kalzumeus.com/item/used-up-uranium-fuel-cell-mk03.md)
- Results: 7 × [Uranium 238](https://factorio.kalzumeus.com/item/u-238.md), 4 × [Uranium 235](https://factorio.kalzumeus.com/item/u-235.md)
- Made in: Centrifuge, Centrifuge MK 01, Centrifuge MK 02, Centrifuge MK 03, Centrifuge MK 04
- Unlocked by an upgrade choice (script), not research

### Uranium 238 (`nuclear-fuel-reprocessing-mk04`)

- 100 s · tier ?
- Ingredients: 5 × [Used up uranium fuel cell MK 04](https://factorio.kalzumeus.com/item/used-up-uranium-fuel-cell-mk04.md)
- Results: 6 × [Uranium 238](https://factorio.kalzumeus.com/item/u-238.md), 3 × [Uranium 235](https://factorio.kalzumeus.com/item/u-235.md)
- Made in: Centrifuge, Centrifuge MK 01, Centrifuge MK 02, Centrifuge MK 03, Centrifuge MK 04
- Unlocked by an upgrade choice (script), not research

### Uranium 238 (`nuclear-fuel-reprocessing-mk05`)

- 100 s · tier ?
- Ingredients: 5 × [Used up uranium fuel cell MK 05](https://factorio.kalzumeus.com/item/used-up-uranium-fuel-cell-mk05.md)
- Results: 8 × [Uranium 238](https://factorio.kalzumeus.com/item/u-238.md), 5 × [Uranium 235](https://factorio.kalzumeus.com/item/u-235.md)
- Made in: Centrifuge, Centrifuge MK 01, Centrifuge MK 02, Centrifuge MK 03, Centrifuge MK 04
- Unlocked by an upgrade choice (script), not research

### Plutonium Oxide (`plutonium-fuel-reprocessing`)

- 100 s · tier 4
- Ingredients: 4 × [Used up mox fuel cell](https://factorio.kalzumeus.com/item/used-up-mox-fuel-cell.md)
- Results: 10 × [Uranium 238](https://factorio.kalzumeus.com/item/u-238.md), 14 × [Plutonium Oxide](https://factorio.kalzumeus.com/item/plutonium-oxide.md)
- Made in: Centrifuge, Centrifuge MK 01, Centrifuge MK 02, Centrifuge MK 03, Centrifuge MK 04
- Unlocked by: [Kovarex enrichment process](https://factorio.kalzumeus.com/tech/kovarex-enrichment-process-2.md), [Nuclear research](https://factorio.kalzumeus.com/tech/uranium-processing.md)

### Yellowcake isotope separation (`split-yellowcake`)

- 10 s · tier 4
- Ingredients: 10 × [Yellowcake](https://factorio.kalzumeus.com/item/yellow-cake.md)
- Results: 1 × [Uranium 235](https://factorio.kalzumeus.com/item/u-235.md) (10% chance of 10), 9 × [Uranium 238](https://factorio.kalzumeus.com/item/u-238.md) (90% chance of 10)
- Made in: Particle accelerator MK 01, Particle accelerator MK 02, Particle accelerator MK 03, Particle accelerator MK 04
- Unlocked by: [Nuclear research](https://factorio.kalzumeus.com/tech/uranium-processing.md)

### Americium 243 (`pu-242-transmutation`)

- 2.5 s · tier 6
- Ingredients: 12 × [Plutonium 242](https://factorio.kalzumeus.com/item/pu-242.md)
- Results: 4 × [Americium 243](https://factorio.kalzumeus.com/item/am-243.md), 1 × [Uranium 238](https://factorio.kalzumeus.com/item/u-238.md), 10 × [Helium](https://factorio.kalzumeus.com/fluid/helium.md)
- Made in: Particle accelerator MK 01, Particle accelerator MK 02, Particle accelerator MK 03, Particle accelerator MK 04
- Unlocked by: [Nuclear power](https://factorio.kalzumeus.com/tech/nuclear-power.md)

### Nuclear fuel reprocessing (`nuclear-fuel-reprocessing`)

- 100 s · tier 6 · productivity modules allowed
- Ingredients: 5 × [Depleted uranium fuel cell](https://factorio.kalzumeus.com/item/depleted-uranium-fuel-cell.md)
- Results: 3 × [Uranium 238](https://factorio.kalzumeus.com/item/u-238.md), 2 × [Plutonium](https://factorio.kalzumeus.com/item/plutonium.md)
- Made in: Centrifuge, Centrifuge MK 01, Centrifuge MK 02, Centrifuge MK 03, Centrifuge MK 04
- Unlocked by: [Nuclear fuel reprocessing](https://factorio.kalzumeus.com/tech/nuclear-fuel-reprocessing.md)

### Plutonium 238 (`u237-pu238`)

- 0.5 s · tier 7
- Ingredients: 10 × [Uranium 237](https://factorio.kalzumeus.com/item/u-237.md), 20 × [Neutron](https://factorio.kalzumeus.com/fluid/neutron.md)
- Results: 9.99 × [Plutonium 238](https://factorio.kalzumeus.com/item/pu-238.md) (99.9% chance of 10), 0.001 × [Uranium 238](https://factorio.kalzumeus.com/item/u-238.md) (0.1% chance)
- Made in: Particle accelerator MK 01, Particle accelerator MK 02, Particle accelerator MK 03, Particle accelerator MK 04
- Unlocked by: [Nuclear Power - Stage 2](https://factorio.kalzumeus.com/tech/nuclear-power-mk02.md)

## Used in (10 recipes)

- Mox fuel cell (`plutonium-fuel-cell`, tier 4) → [Mox fuel cell](https://factorio.kalzumeus.com/item/mox-fuel-cell.md)
- Uranium fuel cell MK 01 (`uranium-fuel-cell`, tier 4) → [Uranium fuel cell MK 01](https://factorio.kalzumeus.com/item/uranium-fuel-cell.md)
- Explosive uranium cannon shell (`explosive-uranium-cannon-shell`, tier 5) → [Explosive uranium cannon shell](https://factorio.kalzumeus.com/item/explosive-uranium-cannon-shell.md)
- Uranium cannon shell (`uranium-cannon-shell`, tier 5) → [Uranium cannon shell](https://factorio.kalzumeus.com/item/uranium-cannon-shell.md)
- Uranium rounds magazine (`uranium-rounds-magazine`, tier 5) → [Uranium rounds magazine](https://factorio.kalzumeus.com/item/uranium-rounds-magazine.md)
- Kovarex enrichment process (`kovarex-enrichment-process`, tier 6) → [Uranium 235](https://factorio.kalzumeus.com/item/u-235.md)
- Plutonium dioxide (`pu239-uf6`, tier 6) → [Plutonium dioxide](https://factorio.kalzumeus.com/fluid/puo2.md)
- Heavy fermion material (`heavy-fermion`, tier 7) → [Heavy fermion material](https://factorio.kalzumeus.com/item/heavy-fermion.md)
- Plutonium 239 (`u238-pu239`, tier 9) → [Plutonium 239](https://factorio.kalzumeus.com/item/pu-239.md)
- Enrich uranium (`pa-uranium-235`, tier ?) → [Uranium 235](https://factorio.kalzumeus.com/item/u-235.md)