How does radiation kill you?

Radiation damages molecular structures, in particular DNA, so that cellular replication fails. This stops the cycle of cellular death and replacement leaving you with only dead cells. And that's bad.

It disrupts molecular bonds. Your cells are complicated little machines, and disrupting enough bonds will cause that machine to break down and the cell will die.

Disrupting bonds in DNA will indeed disturb it, and could very well cause cancer if the disruption is not severe enough to kill the cell(s) outright.

I guess I should have refreshed to see if someone had already answered before I typed my answer.

Although sometimes it is beneficial to hear the same answer described in different words.

Ya think?