Bear Lodge Plan of Operations - page 172

Interim Baseline Radiological Investigation Report in
Support of the Upton Rare Earth Processing Plant November 15, 2012
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TABLE OF CONTENTS
1.0 INTRODUCTION ............................................................................................................ 1
1.1 DESCRIPTION OF THE PROJECT .................................................................................................... 2
1.2 PURPOSE AND SCOPE ................................................................................................................... 2
1.3 ORGANIZATION AND CONTENTS ................................................................................................. 2
2.0 BASELINE FIELD INVESTIGATION SUMMARY AND SCOPE ........................... 4
2.1 OVERALL SCOPE OF PROJECT ...................................................................................................... 4
2.2 DEVIATIONS FROM THE SAP ....................................................................................................... 5
2.3 FUTURE W ORK ............................................................................................................................ 6
3.0 GPS-BASED GAMMA (DIRECT RADIATION) SURVEY........................................ 7
3.1 GPS SURVEY METHODS .............................................................................................................. 7
3.2 RESULTS OF GPS-BASED GAMMA S URVEY ................................................................................ 7
3.3 DERIVATION OF EXPOSURE RATES BASED ON HPIC CORRELATION ........................................ 11
4.0 BASELINE RADIOLOGICAL INVESTIGATION SOIL SAMPLING .................. 16
4.1 SAMPLING STRATEGY AND APPROACH ..................................................................................... 16
4.2 RADIONUCLIDE CONCENTRATIONS IN SURFACE SOILS ............................................................. 18
4.3 SUMMARY OF RADIUM -226 RESULTS........................................................................................ 19
4.3 OTHER RADIONUCLIDES ............................................................................................................ 20
4.4 SURFACE SOIL R ADIUM-226 AND NATURAL THORIUM ESTIMATES B ASED ON GAMMA-SOIL
RADIUM CORRELATION .......................................................................................................................... 21
5.0 DATA QUALITY ASSESSMENT................................................................................ 24
6.0 RADON FLUX MEASUREMENTS............................................................................. 26
7.0 AMBIENT RADON MEASUREMENT LOCATIONS.............................................. 27
8.0 AIRBORNE PARTICULATES..................................................................................... 29
8.1 TOTAL PARTICULATES ..................................................................................................................... 29
8.1.1 Radioactive Particulates............................................................................................. 30
8.1.2 Lanthanide Particulates.............................................................................................. 34
8.2 PARTICULATE MATTER FRACTIONS................................................................................................. 35
9.0 SUMMARY AND CONCLUSIONS ............................................................................. 38
10.0 REFERENCES................................................................................................................ 40