Preliminary Public Dose Evaluation in Support of the Development of
November, 2012
Rare Element Resources, Inc. Bear Lodge Project
iii
Table of Contents (concluded)
List of Tables
Table 1.1
Natural Abundances of Uranium Isotopes
Table 1.2
Background Doses in the U.S. from Natural Sources
Table 2.1
Thorium and Uranium Content of Important Materials at
Proposed Bear Lodge Project
Table 4.1
Thorium-232 and Uranium-238 Activity Concentrations for
Material Used in Dose Evaluation
Table 4.2
Dust Emission Factor for Tailings Storage Facility
Table 4.3
Dust Emission Summary for Bull Hill Mine
Table 4.4
Table 4.5
Emission Summary for Bear Lodge Project.
Radiation Dose Coefficients for Inhalation Pathway
Table 4.6
Dose Factors for Source Terms
Table 4.7
Radiation Dose Estimates to the Public at the Bear Lodge Project
List of Figures
Figure 1.1
Bear Lodge Property Site Layout and Geographic Setting
Figure 1.2
Penetrating Distances of Different Types of Radiation
Figure 1.3
Uranium-238 Decay Series
Figure 1.4
Thorium-232 Decay Series
Figure 2.1
Preliminary Process Flow for PUG and Hydromet
Figure 4.1
Iso-dose Contours for Bear Lodge Area
Figure 4.2
Iso-dose Contours for Upton Area.
List of Appendices
Appendix A
AERMOD Model Output
