What statement correctly describes the relationship between ALI and DAC?

What statement correctly describes the relationship between ALI and DAC?

• A. 2000 DAC equals 1 ALI
• B. DAC is unrelated to ALI
• C. ALI equals 2 DAC
• D. DAC equals ALI

Answer: (A)

ALI is the maximum amount of radioactive material a person can inhale in a year, while DAC is the concentration of that material in the air that would lead to reaching that ALI if breathed for a year. The standard assumption is that a worker inhales about 2,000 cubic meters of air in a year, so the relationship is ALI = DAC × 2,000 m^3. Therefore, 2,000 times the DAC value equals the ALI. This keeps the units consistent—DAC is in Bq/m^3 and ALI is in Bq.

ALI is the maximum amount of radioactive material a person can inhale in a year, while DAC is the concentration of that material in the air that would lead to reaching that ALI if breathed for a year. The standard assumption is that a worker inhales about 2,000 cubic meters of air in a year, so the relationship is ALI = DAC × 2,000 m^3. Therefore, 2,000 times the DAC value equals the ALI. This keeps the units consistent—DAC is in Bq/m^3 and ALI is in Bq.