Field calibration facilities for environmental measurement of radium, thorium, and potassium. Third edition

A key component of Technical Measurements Center support is the development, identification, standardization, and maintenance of calibration facilities for environmental radioelement measurements. This report describes calibration facilities located at Grand Junction, Colorado, and at six secondary sites. These facilities are available to contractors for the calibration of radiometric field instrumentation for in-situ measurements of radium, thorium, and potassium. All of the calibration facilities described herein were constructed by the Department of Energy and its predecessor agencies for use in annual uranium-reserve determinations. The use of these facilities for the calibration of radiometric field instruments used in remedial action is made possible by the commonality of the radiometric measurement technique for uranium and for radium. The use of these facilities will standardize remedial action measurements in a cost-effective manner.