Authors:
H. Chen-Mayer National Institute of Standards and Technology Chemical Science and Technology Laboratory 20899 Gaithersburg MD USA

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V. Sharov X-Ray Optical Systems, Inc. 12205 Albany NY USA

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D. Mildner National Institute of Standards and Technology Chemical Science and Technology Laboratory 20899 Gaithersburg MD USA

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R. Downing X-Ray Optical Systems, Inc. 12205 Albany NY USA

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R. Paul National Institute of Standards and Technology Chemical Science and Technology Laboratory 20899 Gaithersburg MD USA

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R. Lindstrom National Institute of Standards and Technology Chemical Science and Technology Laboratory 20899 Gaithersburg MD USA

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C. Zeissler National Institute of Standards and Technology Chemical Science and Technology Laboratory 20899 Gaithersburg MD USA

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Q. Xiao X-Ray Optical Systems, Inc. 12205 Albany NY USA

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Abstract  

A neutron lens has been constructed to focus cold neutrons from the exit of a58Ni neutron guide, which delivers a beam to the Prompt-Gamma Activation Analysis (PGAA) station at the NIST Cold Neutron Research Facility. The lens compresses a neutron beam of cross section 50 mm× 45 mm onto a focal spot of diameter 0.53 mm (fwhm) wich an average gain of 80 in neutron current density. PGAA measurements have been performed to demonstrate the enhanced sensitivity and detection limits for various elements and the spatial resolution in one transverse dimension. For the two test particles (a gadolinium glass bead and cadmium metal of sizes less than 0.5 mm), the gain in the -count rate with the lens is a factor of 60, and the detection limit is improved by a factor of 20. The system can be used for two-dimensional mapping of samples on a sub-millimeter scale to complement other analytical techniques such as neutron depth profiling (NDP).

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Journal of Radionalytical and Nuclear Chemistry
Language English
Size A4
Year of
Foundation
1968
Volumes
per Year
1
Issues
per Year
12
Founder Akadémiai Kiadó
Founder's
Address
H-1117 Budapest, Hungary 1516 Budapest, PO Box 245.
Publisher Akadémiai Kiadó
Springer Nature Switzerland AG
Publisher's
Address
H-1117 Budapest, Hungary 1516 Budapest, PO Box 245.
CH-6330 Cham, Switzerland Gewerbestrasse 11.
Responsible
Publisher
Chief Executive Officer, Akadémiai Kiadó
ISSN 0236-5731 (Print)
ISSN 1588-2780 (Online)