of one hundred fifty to undergo nuclear tests say it's seven hundred kilos of plutonium underneath merola what does that mean. one tenth of a millionth of a gram of plutonium can cause cancer and he said it's radioactive half life is twenty four thousand four hundred years. that's means it will take more than two hundred forty thousand years before it can be considered harmless you are forced into. this assumption that pony will not go anywhere which is held by testing authorities i think in more than one country turns out to be not quite right. recent research done by the us government in there about it indicates that in one test site has migrated quite far from the past already within forty years. one of the additional problems that have been discovered in the last fifteen years that turned out to be a very complicated substance chemical so the behavior is very difficult to characterize and it made my great faster in the water. than before and so now we have to worry about that and you know we have seven hundred kilos down there. so nobody knows if more rule is stabilize. the heart of m