Remote In-Situ Monitoring of Metal Contaminants in Groundwater with a Compact Grazing-Incident Monochromatic Microbeam X-Ray Fluorescence Analyzer

75684S The evaluation of radionuclide and metal contaminants, found in the groundwater during the monitoring of DOE sites, is typically done off-site, using plasma mass spectroscopy or optical emission spectrometry. These analysis techniques are not suitable for automated field use because they require control gas or vacuum to function. A simple, robust, non-destructive analysis technique is required for in situ remote monitoring applications. This project will develop a grazing-incident-monochromatic micro x-ray fluorescence (GI-MMXRF) analysis system, which, when combined with an innovative dried spot sample preparation system, will offer high sensitivity and automated sample preparation. The combination of low power GI-MMXRF and ink jet printing technology makes this an approach that can be readily adapted for remote monitoring or in situ applications. In Phase I, a doubly-curved crystal optic was designed for use with an existing x-ray fluorescence analysis setup. A lab setup of the sample deposition system demonstrated GI-MMXRF detection at parts-per-billion (ppb) levels. A detailed onceptual design of a field-deployable system was developed. In Phase II, the optics will be further developed to increase sensitivity and reliability, and system optimization will be performed to decrease system size, weight, power, and cost. Measurements with contaminated and base ground water samples will be used to demonstrate remote, unattended field operation. Commercial Applications and Other Benefits as described by the awardee: In addition to the remote monitoring of radio nuclides and metals in groundwater at hundreds of DOE sites, the technology also should draw interest from industries and government agencies concerned with the monitoring of groundwater and groundwater remediation.