system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: What exactly is radiation/ radiation poisoning and why aren't there ways to "flush" it out of your system?
gpt
Think of radiation as little tiny bullets, that smash into the molecules that make up your cells, breaking them apart. 

If enough of your molecules get smashed, then you have "radiation poisoning," which is really just the symptoms associated with that kind of damage. But note, it's not like what we normally think of as poisoning, because there's no "poison" left.  The damage is already done, and it's done at the atomic level.

That's why it can't just be flushed.  The body needs to recover from the damage, not remove the "toxin" that caused the damage.