ALI stands for which of the following?

• A. Annual Limit on Intake
• B. Derived Air Concentration
• C. Committed Dose Equivalent
• D. Committed Effective Dose Equivalent

Answer: (A)

Annual Limit on Intake is the maximum amount of radioactive material a person can intake in a year that would produce a committed dose equal to the regulatory limit for that year. It ties the physical amount of material to the allowable dose, and is specific to the radionuclide and form. In practice, this helps determine when monitoring or controls are needed, since crossing this limit would mean the employee has reached or exceeded the allowed annual dose from intake.

Derived Air Concentration is a related concept, representing the concentration of radioactive material in air that, given a defined breathing rate and time, would lead to the ALI. It’s about air concentration, not the intake limit itself. Committed Dose Equivalent and Committed Effective Dose Equivalent are dose quantities describing the radiation dose accumulated from an intake over time, not the allowable intake amount.