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Hanford workers are making progress digging up the 618-7 burial ground, just north of Richland, Wash., as part of the cleanup of the nuclear reservation. Among debris they’ve unearthed are drums with potentially flammable shavings of a zircaloy and beryllium alloy and some large stainless steel tanks, one of them holding some radioactive thorium oxide powder.
Herald video/Annette Cary
