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Title: Project Title: Radiochemical Analysis by High Sensitivity Dual-Optic Micro X-ray Fluorescence

A novel dual-optic micro X-ray fluorescence instrument will be developed to do radiochemical analysis of high-level radioactive wastes at DOE sites such as Savannah River Site and Hanford. This concept incorporates new X-ray optical elements such as monolithic polycapillaries and double bent crystals, which focus X-rays. The polycapillary optic can be used to focus X-rays emitted by the X-ray tube thereby increasing the X-ray flux on the sample over 1000 times. Polycapillaries will also be used to collect the X-rays from the excitation site and screen the radiation background from the radioactive species in the specimen. This dual-optic approach significantly reduces the background and increases the analyte signal thereby increasing the sensitivity of the analysis. A doubly bent crystal used as the focusing optic produces focused monochromatic X-ray excitation, which eliminates the bremsstrahlung background from the X-ray source. The coupling of the doubly bent crystal for monochromatic excitation with a polycapillary for signal collection can effectively eliminate the noise background and radiation background from the specimen. The integration of these X-ray optics increases the signal-to-noise and thereby increases the sensitivity of the analysis for low-level analytes. This work will address a key need for radiochemical analysis of high-level waste usingmore » a non-destructive, multi-element, and rapid method in a radiation environment. There is significant potential that this instrumentation could be capable of on-line analysis for process waste stream characterization at DOE sites.« less
Authors:
;
Publication Date:
OSTI Identifier:
835000
Report Number(s):
EMSP-81967-2002
R&D Project: EMSP 81967; TRN: US0407416
DOE Contract Number:
FG07-01ER63280
Resource Type:
Technical Report
Resource Relation:
Other Information: PBD: 1 Jun 2002
Research Org:
Los Alamos National Laboratory, Los Alamos, NM; X-Ray Optical Systems, Albany, NY (US)
Sponsoring Org:
USDOE Office of Environmental Management (EM) (US)
Country of Publication:
United States
Language:
English
Subject:
12 MANAGEMENT OF RADIOACTIVE WASTES, AND NON-RADIOACTIVE WASTES FROM NUCLEAR FACILITIES; 54 ENVIRONMENTAL SCIENCES; 37 INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY; BREMSSTRAHLUNG; EXCITATION; FLUORESCENCE; FOCUSING; HIGH-LEVEL RADIOACTIVE WASTES; OPTICS; RADIATIONS; RADIOCHEMICAL ANALYSIS; SCREENS; SENSITIVITY; WASTES; X-RAY SOURCES; X-RAY TUBES