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10 fCi 55Fe

aThe use of thorium in gas mantles, vacuum tubes, welding rods, incandescent lamps, photographic films, and finished optical lenses is also not regulated. Naturally occurring radioactive materials (NORM) present in geologic specimens, petroleum drilling wastes, and rare earth minerals processing wastes (with the exception of uranium and thorium) are also not regulated.

aThe use of thorium in gas mantles, vacuum tubes, welding rods, incandescent lamps, photographic films, and finished optical lenses is also not regulated. Naturally occurring radioactive materials (NORM) present in geologic specimens, petroleum drilling wastes, and rare earth minerals processing wastes (with the exception of uranium and thorium) are also not regulated.

Mixed low-level radioactive waste contains both radioactive and hazardous components and meets, respectively, NRC's definition of low-level radioactive waste in 10 CFR Part 61, and the Environmental Protection Agency's definition of hazardous material in 40 CFR Part 261. Although any type of low-level waste may be "mixed," surveys of waste generators indicate that less than five percent of the wastes to be sent to commercial sites would be classified as mixed (Bowerman, Davis & Siskind 1986). An example of a mixed waste would be a contaminated flammable extraction solvent used in radioisotope recovery. NRC deregulation of scintillation fluids containing minimal quantities of 3H and 14C has eliminated the largest source of mixed waste from disposal as LLRW.

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