Pu 239 Pit is a item from Nuclearcraft Neoteric, crafted from Plutonium 239 and Neutron Initiator.
Crafting using Plutonium 239, Plutonium 239, Plutonium 239, Plutonium 239, Neutron Initiator, Plutonium 239, Plutonium 239, Plutonium 239 and Plutonium 239, arranged in the pattern shown. Produces Pu 239 Pit.
Crafting 
Pu 239 Pit guaranteedCrafting using Uranium 238, Uranium 238, Uranium 238, Uranium 238, Pu 239 Pit, Uranium 238, Uranium 238, Uranium 238 and Uranium 238, arranged in the pattern shown. Produces Pu 239 Core.
Crafting 
Pu 239 Core guaranteed
nuclearcraft:pu_239_pitnuclearcraftnuclearcraftnuclearcraft:items/parts
Recipe JSON (1):
{
"recipe_type": "minecraft:crafting_shaped",
"pattern": [
"FFF",
"FNF",
"FFF"
],
"ingredients": {
"F": {
"item": "nuclearcraft:plutonium_239"
},
"N": {
"item": "nuclearcraft:neutron_initiator"
}
},
"conditions": [],
"sequence": null,
"group_name": null,
"experience": null,
"cooking_time": null
}