- Relatively we receive a lot of radiation naturally
- Beyond that, the most significant exposure to radiation is from medical scans
- Finally, you would have to live nearby (~50k) the site of a perpetual nuclear catastrophe at it's worst (such as Fukushima) for at least half a year straight to receive severe radiation poisoning.
That's not to put the harm of radiation poisoning lightly, but relatively, the potential threat of radiation poisoning is significantly less then what I imagined.
Full size image. via io9