The objective of this analysis is to develop values for the parameters used in the ERMYN that represent characteristics of the human receptor. The receptor considered in this analysis, the RMEI, is defined in Section 6.1. The methods and parameters used in the biosphere model to evaluate receptor exposure are presented in Section 6.2. Characteristics of the RMEI are based on regulations (10 CFR Part 63 (156605); see also Section 6.1) and on the range of conditions typical of the environment and population in the Amargosa Valley. Local lifestyle and diet characteristics are considered. Lifestyle parameters are discussed in Section 6.3 and Section 6.6, and include the type and location of employment as well as the associated proportions of population, land use, activity budgets (i.e., amount of time spent conducting activities and the location where those activities occur), recreation, and characteristics of dwellings. Lifestyle characteristics are considered in the biosphere model in parameters for the exposure time, fraction of houses with evaporative coolers, evaporative cooler use factor; inadvertent soil ingestion rate, and building shielding factor. Dietary parameters are discussed in Section 6.4. Dietary characteristics include consumption rate of contaminated food and water. These characteristics are considered in the model parameters for consumption rate of water and consumption rates of locally produced leafy vegetables, other vegetables, fruit, grain, meat, poultry, milk, eggs, and fish. This analysis report also develops values for breathing rates (which are related to physiology of the receptor; Section 6.3.3), describes the dosimetric methods used to convert internal and external exposure of the receptor to radiation doses, selects dose coefficients for internal and external exposure (Section 6.5), and building shielding factors (Section 6.6).
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