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Low-level radioactive waste policy of the United States

  • 16 min read
  • 9 chapters

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Through Radioactive waste, Radioactive decay and Half-life

Classes of low level waste

The U.S. Nuclear Regulatory Commission (NRC) has LLW broken into three different classes: A, B, and C. These classes are based on the wastes' concentration, half-life, as well as what types of radionuclides it contains. Class A consists of radionuclides with the shortest half-life and lowest concentrations. This class makes up 95% of LLW and its radioactivity levels return to background levels within 100 years. Classes B and C contain greater concentrations of radionuclides with longer half-lives, fading to background levels in less than 500 years. They must meet stricter disposal requirements than Class A waste. Any LLW that exceeds the requirements for class C waste is known as “Greater Than Class C”; this material makes up less than 1 percent of all LLW and is the responsibility of the United States Department of Energy under federal law.

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