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Title: Neutron Capillary Optics for Prompt Gamma Activation Analysis

Abstract

Prompt gamma activation analysis is usually performed with a polychromatic quasi-parallel beam, and preferably with cold neutrons (wavelengths > 0.4 nm) to increase the sensitivity for the detection of trace elements. A cold neutron beam can be focused to an {approx}0.5-mm-wide spot with nearly two orders of magnitude increase in beam current density by using thousands of curved glass capillary fibers, each with thousands of narrow hollow capillaries acting as miniature glass guides. Such an intense probe of cold neutrons can be used to improve both the detection limits of individual elements and the spatial resolution for chemical analysis as a function of position in samples. We have installed a bender-focuser lens at the end of a guide for use on a cold neutron prompt gamma activation analysis (PGAA) instrument. This paper describes the lens as well as various observations that show gains in sensitivity with its use.

Authors:
; ; ;
Publication Date:
Research Org.:
National Institute of Standards and Technology, Gaithersburg, MD (US)
Sponsoring Org.:
none (US)
OSTI Identifier:
786123
Report Number(s):
ISSN 0003-018X; CODEN TANSAO
ISSN 0003-018X; CODEN TANSAO; TRN: US0109291
Resource Type:
Conference
Resource Relation:
Conference: 2000 Annual Meeting, San Diego, CA (US), 06/04/2000--06/08/2000; Other Information: Transactions of the American Nuclear Society, Volume 82; PBD: 4 Jun 2000
Country of Publication:
United States
Language:
English
Subject:
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY; 37 INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY; NEUTRON ACTIVATION ANALYSIS; COLD NEUTRONS; BEAM OPTICS; SPATIAL RESOLUTION; TRACE AMOUNTS; PROMPT GAMMA RADIATION; OPTICAL FIBERS; NEUTRON BEAMS

Citation Formats

David F. R. Mildner, H. Heather Chen-Mayer, E. A. Mackey, and R. L. Paul. Neutron Capillary Optics for Prompt Gamma Activation Analysis. United States: N. p., 2000. Web.
David F. R. Mildner, H. Heather Chen-Mayer, E. A. Mackey, & R. L. Paul. Neutron Capillary Optics for Prompt Gamma Activation Analysis. United States.
David F. R. Mildner, H. Heather Chen-Mayer, E. A. Mackey, and R. L. Paul. Sun . "Neutron Capillary Optics for Prompt Gamma Activation Analysis". United States.
@article{osti_786123,
title = {Neutron Capillary Optics for Prompt Gamma Activation Analysis},
author = {David F. R. Mildner and H. Heather Chen-Mayer and E. A. Mackey and R. L. Paul},
abstractNote = {Prompt gamma activation analysis is usually performed with a polychromatic quasi-parallel beam, and preferably with cold neutrons (wavelengths > 0.4 nm) to increase the sensitivity for the detection of trace elements. A cold neutron beam can be focused to an {approx}0.5-mm-wide spot with nearly two orders of magnitude increase in beam current density by using thousands of curved glass capillary fibers, each with thousands of narrow hollow capillaries acting as miniature glass guides. Such an intense probe of cold neutrons can be used to improve both the detection limits of individual elements and the spatial resolution for chemical analysis as a function of position in samples. We have installed a bender-focuser lens at the end of a guide for use on a cold neutron prompt gamma activation analysis (PGAA) instrument. This paper describes the lens as well as various observations that show gains in sensitivity with its use.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {2000},
month = {6}
}

Conference:
Other availability
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