[calenel]

Iron 60 decays into Cobalt 60 (beta emission), which is pretty nasty stuff. The stuff that they would use as a jacket for a nuclear weapon if they wanted to sterilize a target. Fortunately it has a relatively short half-life and Iron 60 has a much longer half-life so Cobalt 60 is produced very slowly.

[SunkenCiv]

Thanks!