## How does LANL estimate the potential dose to the public?

### What is the Maximally Exposed Individual?

Source Millirem
LANL All-pathways/year 0.5 â€“ 3
Dental X-ray/each 2 - 3
Mammogram 3
Flight/hour 0.4
Chest X-ray 6
Barium swallow 150
• Calculates the dose to the maximally exposed individual (MEI)
• MEI is a hypothetical person located on the border of LANL property
• Assumes 24 hours of every day of the year constantly at the location
• Assumes the person eats food grown and drinks water found at the location
• The limit that LANL is allowed to contribute is less than 10 millirem

LANL calculates doses from two different MEIs:

• Airborne-pathway MEI
• Location is determined by using AIRNET data, stack sampling, and computer models to
calculate the greatest potential airborne dose.
• All-pathway MEI
• Considers every possible way radiation from LANL might affect a human.
• To determine the dose, the potential dose to each pathway is calculated. The doses are
then added together for a total all-pathways dose.