Another way of looking at it, assuming the numbers are correct: If a mad villain gets hold of Japan and force every Japanese citizen to drink an equal part of

Another way of looking at it, assuming the numbers are correct: If a mad villain gets hold of Japan and force every Japanese citizen to drink an equal part of C14 distilled from Fukushima's waste water, every one will ingest about 503 Bq worth of C14. That sounds like a lot, until you realize your body naturally contains about 4,300 Bq of naturally radioactive potassium. From Wikipedia: > A 70 kg human body contains about 140 grams of potassium, hence about 0.000117 × 140 = 0.0164 grams of 40K; whose decay produces about 4,300 disintegrations per second (becquerel) continuously throughout the life of the body. Literally, a thin person who drinks 503 Bq of C14 solution will still have less radioactivity going on inside their own body than a fat person who didn't drink it, just by virtue of weighing less (and having less potassium in their body).