Pu-239 and U-235, the most common elements in nukes, are not very radioactive. Both alpha decay, meaning they're only really dangerous if inhaled as dust (or if

Pu-239 and U-235, the most common elements in nukes, are not very radioactive. Both alpha decay, meaning they're only really dangerous if inhaled as dust (or if they fission, obviously). Pu-239 has a half-life of around 24k years iirc, while U-235 is over 700 million years.