Surface soil contamination standards for Rockwell Hanford Operations

The four basic radiation protection criteria (external radiation, ingestion of radioactivity, concentrations of radioactivity in air, and concentrations of radioactivity in water) can be met for each type of contamination by deriving contamination limits in the manner described below and adopting the most restrictive limit as a standard. Four separate limits for average soil contamination are developed below. These limits are derived from four conditions that may result in human radiation dose: external radiation, ingestion of soil, airborne radioactivity, and radioactivity in water. The most restrictive limit for each radionuclide is taken as the average surface soil contamination standard. The average surface soil contamination standard is then used to develop areal contamination standards and spot contamination standards