but right now from what i have read and understand, only six workers have received more than 100 mill ee verts, that's a unit we receive from natural sources 3 per year. it's larger than what we receive naturally. in contrast, the former soviet union sent a half million recovery workers to chernobyl to clean up the radiation damage. their average dose for the half million workers was 100 miss ee verts. even among the workers, there's only 6. >> what is the biggest threat right now from -- if nothing more happens and we've had some people say -- the threat to