Half a curie is an extremely dangerous source! An acquaintance of mine who ran a research reactor for something like ten years was surprised they made a 0.5 Ci

Half a curie is an extremely dangerous source! An acquaintance of mine who ran a research reactor for something like ten years was surprised they made a 0.5 Ci Cs-137 at that gauge. He had expected a mining source to be in the tens of mCi range when the news first broke (though he also admitted he's less knowledgeable about mining industry uses than other ones).