Occupational Dose Evaluation in Support of the Development of
October, 2012
Rare Element Resources, Inc. Bear Lodge Project
ERG
ii
Table of Contents (continued)
3.4.4
Conference of Radiation Control Program Directors ............................................. 17
3.4.5
International Guidance............................................................................................ 18
3.5
Regulations on the Transport of Radioactive Material .................................................. 18
Section 4
Occupational Worker Dose Assessment ................................................................. 20
4.1
Worker Dose Estimates .................................................................................................. 21
4.1.1
Dose Coefficients.................................................................................................... 22
4.1.2
Estimated Worker Doses......................................................................................... 23
Section 5
Summary ................................................................................................................. 25
Section 6
References............................................................................................................... 26
List of Tables
Table 1.1
Natural Abundances of Uranium Isotopes
Table 1.2
Background Doses in the U.S. from Natural Sources (mrem y
-1
)
Table 2.1
Thorium and Uranium Content of Important Materials at
Proposed Bear Lodge Project
Table 3.1
Exempt Activity Concentration and Activity Limits for
Transportation.
Table 4.1
Thorium-232 and Uranium-238 Activity Concentrations for
Material Used in Dose Evaluation
Table 4.2
Worker Radiation Dose Coefficients for Inhalation and
Ingestion Pathways.
Table 4.3
Input Parameters Used to Estimate Worker Radiation Dose.
Table 4.4
Radiation Dose Estimates for Workers at the Bear Lodge
Project (mrem y
-1
)
