Radioactive Bar is a rare crafting material obtained by smelting Radioactive Ore in a furnace. It requires five ores and one coal to create and takes 10 in-game hours to smelt. This glowing green bar is used in various high-level crafting recipes, including the crafting of the Radioactive Sprinkler, which waters the 24 adjacent tiles every morning, and is also a component in tailoring and upgrading tools to their radioactive version, providing the highest efficiency.
The item ID for Radioactive Bar is 910
This ID will work on PC/Mac (Steam), PS4, PS5, XBOX One, and Nintendo Switch.
Spawning items in Stardew Valley is a little unsual and is not done with commands. You will need to utilize what is called a cheat to set your character's or animal name to the item id. To do this you cannot use just the item id, you will need to surround the item id with brackets. Ex. [910]
Spawning Using the Animal MethodTo spawn Radioactive Bar while using an animal, you will need to head over to Marine's Ranch and purchase an animal. Once you have have an animal chosen, name the animal with the item id with brackets like this [910] and you will receive the Radioactive Bar item. This method can be done using an existing character and is convenient but will cost some gold every time you want an item.
Spawning Using the Character MethodTo spawn Radioactive Bar while using a character, you will need to create a new character and name it with the item id with brackets like this [910]. You will then receive the Radioactive Bar item when you speak to a villager. This method is easy and free but cannot be performed on an existing character and you will be stuck with that name unless its edited.