(01-20-2013, 04:58 PM)UniqueStranger Wrote:
(01-20-2013, 04:47 PM)Shadow Wrote: Almost two years after the awful nuclear disaster occurred, a fish caught near Fukushima on Friday January 18th had a record-breaking level of radioactive contamination over 2500x the legal limit. TEPCO measured 'Mike the Murasoi' at 254,000 becquerels per kilogram (with the limit for edible seafood at 100 becquerels). As Le Monde reports, the previous record (caught on August 21st 2012) was a mere 25,800 becquerels/kg. As further precautions, TEPCO is installing new nets 20km around the Fukushima Daichi site to avoid highly contaminated fish gettig too far and being consumed by other species.
Why didn't they put up the nets two years ago?
Did the math on this. The sensible pre Fukushima limit was 500 Bq/kg. The limit was cut to 100 Bq/kg to give the natives a false sense of security and is causing them to throw away a lot of perfectly good food. The Murasoi is about 2.1 kg.
The typical human is at the limit of consumption 100 Bq/kg (so remember not to eat more than about 8 oz of human per day).
The fish represents about 2-3 lbs of meat. In Japan this would be 8 oz for 4 people. 254,000 Bq/kg = = 58 kBq/0.5 lbs serving. For a 160 lb (72.6 kg) person this would result in 795 Bq/kg intake and (assuming 50% retention) 397 Bq/kg absorbed for a total of 497 Bq/kg. So by the original Japanese standard the human would still be edible.
The half life (retention period) of Cesium is 70 days. So it would take about 5 months eating non-radioactive food to get down to the current Japanese limit of 100 Bq/kg.
As an aside - I didn't realize that humans were normally so radioactive. That is probably a result of being at the top of the food chain.