高輻射水準意味著高癌症風險。沒有安全劑量。任何劑量的輻射都會導致某些損害或損傷組織，即使損傷實際上並不導致癌症。例如，輻射可導致血管損傷，導致血管疾病。
https://www.cancer.gov/about-cancer/causes-prevention/risk/radiation/stateandcountyexposure
Foods that carry high levels of radioactive substances.
| Natural Radioactivity in Food | ||
|---|---|---|
| Food | 40K (pCi/kg) | 226Ra (pCi/kg) |
| Bananas | 3,520 | 1 |
| Carrots | 3,400 | 0.6 – 2 |
| White Potatoes | 3,400 | 1 – 2.5 |
| Lima Beans (raw) | 4,640 | 2 – 5 |
| Red Meat | 3,000 | 0.5 |
| Brazil Nuts | 5,600 | 1,000 – 7,000 |
| Beer | 390 | — |
| Drinking Water | — | 0 – 0.17 |
cited from https://www.nrc.gov/about-nrc/radiation/around-us/doses-daily-lives.html
