Lepmuru t1_j50w8vg wrote
Reply to comment by SethSky in What exactly happens in your body when you touch or consume a radioactive substance i.e U235 or Pu239. What happens on the cellular level and how the brain & nervous system deals with it? by Baby-saint
Our body does not have a defense mechanism against ionizing radiation, that is true. Though, we do have countermeasures against its effects.
DDR, or DNA-damage-response, is a cluster of measures cells regularly deploy to restore DNA damage caused by radiation, amongst others. They are not without failure, which is why cancer exists. Nevertheless, these processes are exceedingly powerful when it comes to restoring defective DNA. Without them, cancer would be more frequent by several orders of magnitude.
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