Sadly I got around to looking up decay chains and the isotope of lead that is at the bottom of the chain containing [plutonium 243](https://en.wikipedia.org/wiki/Isotopes_of_plutonium] ends at lead 207 which is only 22% of the lead on Earth, so you’re unlikely to get anything instantly dangerous. Though if your lead came from an ancient natural reactor your chances are much better
i cast mending on the pile of lead, giving me a solid cubic foot of weapons grade plutonium.
Briefly
hey DM what’s the range of mending? as long as it’s over a few kilometers i should be fine
Sadly I got around to looking up decay chains and the isotope of lead that is at the bottom of the chain containing [plutonium 243](https://en.wikipedia.org/wiki/Isotopes_of_plutonium] ends at lead 207 which is only 22% of the lead on Earth, so you’re unlikely to get anything instantly dangerous. Though if your lead came from an ancient natural reactor your chances are much better