I recently read about Cohens challange to go on national tv against any nucler critic and eat as much Plutonium oxide in weight as the opponet eats caffeine. Ld50 for caffeine is around 13 grams. But if my calculations are right far less than 13grams of plutonium would be lethal. According to Cohen himself and other references the dose in Sv for each Bq of Pu239 ingested is 1*10^-7 Sv/Bq. 13grams of Pu239 is 3*10^10Bq so ingesting it should give a dose of 3000Sv!!!(Assuming it takes around 48hours for it to pass through the digestive system) So how could Cohen make that challange?