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That's a great point. I have no idea, and now I'm also curious. Not quite curious enough to google it though haha

What you both probably want to read about are the following two:

The predominant wisdom is the linear no threshold model - https://en.m.wikipedia.org/wiki/Linear_no-threshold_model

and the counter argument, the radiation hormesis hypothesis - https://en.m.wikipedia.org/wiki/Radiation_hormesis

Thanks for linking these, I'm surprised by the level of uncertainty and complexity here -- it's really interesting.

It is a great question, the answer is nobody really knows for sure.