High level waste
Radioactive waste with a high activity concentration of both short- and long- lived radionuclides typically in the range of 104 to 106 TBq/m3. It generates significant quantities of heat from radioactive decay and normally continues to generate heat for several centuries. This waste requires a high degree of containment isolation from the environment to ensure long-term safety.
ICRP Glossary entry - May 2019
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