On the other end of the radiation scale...
The Banana Equivalent Dose. (BED)
Eating a banana gives you a radiation dose of 0.1 micro-Sieverts (0.0001 milli-Sieverts).
Radiation is detectable at incredibly small levels because, well, it radiates. You will see a lot of stories in the next week about "RADIATION DETECTED AT (fill in the blank)." These amounts will be incredibly small. Bet on it.
If there are units given in the news story - and there usually won't be, bet on that too - convert them to BED.