system
Given the following post, respond as if you're commenting on Reddit:
human
Why are people and objects still dangerous after severe radiation exposure?

I can't seem to find the answer through a google search.
gpt
Two possible reasons:

1) They are contaminated with radioactive material. This is the most likely explanation.

2) They have absorbed a lot of neutron radiation, which has converted stable isotopes to unstable isotopes. This only happens with neutron radiation, and requires a very large dose of it to make the object dangerous.