Radiaiton is actually pretty weak cancerogen. You must be exposed to very high doses to get deterministic effects.
Take a look at dose chart [https://xkcd.com/radiation/](https://xkcd.com/radiation/) .
If you want to know more about aftermath of chernobyl and fukushima watch this lecture from the director of Chernobyl tissue bank: [https://youtu.be/pOvHxX5wMa8](https://youtu.be/pOvHxX5wMa8) (Radiation Health Risks from Nuclear Accidents – Facts and Fantasy) (and effects of radiation are explained pretty much ELI5 ).
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