Glossary cont'd - doe-std-1128-98

DOE-STD-1128-98

TRU: Transuranic (TRU) waste refers to waste materials containing elements with atomic

numbers greater than 92. These elements are generally alpha-emitting radionuclides that decay

slowly. The TRU waste contains a concentration of these elements greater than 100 nCi/g. The

TRU waste is not as intensely radioactive as HLW. The TRU waste also decays slowly, requiring

long-term isolation. (DOE/S-0101)

very high radiation area: Any area accessible to individuals in which radiation levels could

result in an individual receiving an absorbed dose in excess of 500 rad (5 gray) in 1 hour at 1

meter from a radiation source or from any surface that the radiation penetrates. (10 CFR 835)

workplace monitoring: The measurement of radioactive material and/or direct radiation levels in

areas that could be routinely occupied by workers.

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