Cold neutron prompt gamma-ray activation analysis at NIST — Recent developments

1997 ◽  
Vol 215 (1) ◽  
pp. 63-68 ◽  
Author(s):  
R. L. Paul ◽  
R. M. Lindstrom ◽  
A. E. Heald
Keyword(s):  
Activation Analysis ◽  
Gamma Ray ◽  
Cold Neutron ◽  
Prompt Gamma ◽  
Recent Developments

Characterization of Materials for a Hydrogen-Based Economy by Cold Neutron Prompt Gamma-Ray Activation Analysis

2008 ◽  
Vol 1098 ◽  
Author(s):  
Rick Paul ◽  
Lei Raymond Cao
Keyword(s):  
Activation Analysis ◽  
Hydrogen Storage ◽  
Gamma Ray ◽  
Cold Neutron ◽  
Proton Conductors ◽  
Prompt Gamma ◽  
Hydrogen Storage Materials ◽  
Storage Materials ◽  
Characterization Of Materials

AbstractAn instrument for cold neutron prompt gamma-ray activation analysis (PGAA) at the NIST Center for Neutron Research (NCNR) has proven useful for the chemical characterization of hydrogen storage materials and other materials of importance to a hydrogen-based economy. The detection limit for hydrogen is less than 10 mg/kg for most materials. Potential hydrogen storage materials that have been characterized by PGAA include single-wall carbon nanotubes with and without boron doping, porous carbons, lithium magnesium imides, and ternary hydrides of various elements. The capability to allow in situ hydrogenation and characterization of materials is currently under development. PGAA has also been used to characterize materials used in hydrogen fuel cells, including solid proton conductors, polymer membrane, and proton exchange membranes. Future upgrades to the instrument will improve detection limits and functionality of the instrument.

Determination of Hydrogen in Metals, Semiconductors, and Other Materials by Cold Neutron Prompt Gamma-Ray Activation Analysis

1998 ◽  
Vol 513 ◽  
Author(s):  
R. L. Paul ◽  
R. M. Lindstrom
Keyword(s):  
Activation Analysis ◽  
Titanium Alloys ◽  
Gamma Ray ◽  
Cold Neutron ◽  
Detection Limits ◽  
Prompt Gamma ◽  
Nondestructive Measurement ◽  
Hydrogen In Metals

ABSTRACTCold neutron prompt gamma-ray activation analysis has proven useful for nondestructive measurement of trace hydrogen. The sample is irradiated in a beam of neutrons; the presence of hydrogen is confirmed by the emission of a 2223 keV gamma-ray. Detection limits for hydrogen are 3 mg/kg in quartz and 8 mg/kg in titanium. We have used the technique to measure hydrogen in titanium alloys, germanium, quartz, fullerenes and their derivatives, and other materials.

NGD cold-neutron prompt gamma-ray activation analysis spectrometer at NIST

2014 ◽  
Vol 304 (1) ◽  
pp. 189-193 ◽  
Author(s):  
Rick L. Paul ◽  
Dağıstan Şahin ◽  
Jeremy C. Cook ◽  
Christoph Brocker ◽  
Richard M. Lindstrom ◽  
...  
Keyword(s):  
Activation Analysis ◽  
Gamma Ray ◽  
Cold Neutron ◽  
Prompt Gamma

scholarly journals Neutron captue prompt gamma-ray activation analysis at the NIST Cold Neutron Research Facility

1993 ◽  
Vol 167 (1) ◽  
pp. 121-126 ◽  
Author(s):  
R. M. Lindstrom ◽  
R. Zeisler ◽  
D. H. Vincent ◽  
R. R. Greenberg ◽  
C. A. Stone ◽  
...  
Keyword(s):  
Activation Analysis ◽  
Gamma Ray ◽  
Cold Neutron ◽  
Prompt Gamma ◽  
Research Facility

Characterization of Hydrogen in Concrete by Cold Neutron Prompt Gamma-Ray Activation Analysis and Neutron Incoherent Scattering

1999 ◽  
Vol 591 ◽  
Author(s):  
Rick L. Paul ◽  
H. Heather Chen-Mayer ◽  
Richard M. Lindstrom ◽  
Menno Blaauw
Keyword(s):  
Activation Analysis ◽  
Neutron Beam ◽  
Gamma Ray ◽  
Cold Neutron ◽  
Incoherent Scattering ◽  
Prompt Gamma ◽  
Scattered Neutrons ◽  
Nondestructive Characterization

ABSTRACTA combination of cold neutron prompt gamma-ray activation analysis (PGAA) and neutron incoherent scattering (NIS) has been used for nondestructive characterization of hydrogen as a function of position in slabs of wet concrete of different compositions. Hydrogen was determined by PGAA by scanning each sample across a 5 mm diameter neutron beam in 10 mm increments, and measuring the 2223 keV prompt gamma ray. NIS measurements were performed by scanning the sample across a 5 mm diameter neutron beam at 5 mm increments and detecting scattered neutrons. The measurements demonstrate the feasibility of the techniques for 2D compositional mapping of hydrogen and other elements in materials, and indicate the potential of these methods for monitoring the uniformity of drying concrete.

On the construction of a new instrument for cold-neutron prompt gamma-ray activation analysis at the FRM-II

2005 ◽  
Vol 265 (2) ◽  
pp. 221-227 ◽  
Author(s):  
P. Kudějová ◽  
Th. Materna ◽  
J. Jolie ◽  
A. Türler ◽  
P. Wilk ◽  
...  
Keyword(s):  
Activation Analysis ◽  
Gamma Ray ◽  
Cold Neutron ◽  
Prompt Gamma ◽  
New Instrument

Cold Neutron Prompt Gamma-Ray Activation Analysis for Characterization of Hydrogen Storage and Related Materials

2006 ◽  
Vol 927 ◽  
Author(s):  
Rick Paul
Keyword(s):  
Activation Analysis ◽  
Hydrogen Storage ◽  
Gamma Ray ◽  
Cold Neutron ◽  
Hydrogen Uptake ◽  
Proton Conductors ◽  
Prompt Gamma ◽  
Carbon Nanohorns ◽  
Single Wall Carbon Nanohorns

ABSTRACTPrompt gamma-ray activation analysis (PGAA) is an important technique for analyzing materials that may impact the hydrogen economy. An instrument for cold neutron PGAA, located at the NIST Center for Neutron Research (NCNR), has proven useful for the measurement of hydrogen and other elements in a variety of such materials. The detection limit for hydrogen is less than 10 mg/kg for most materials. PGAA has been used to characterize materials with potential for hydrogen storage (e.g. single wall carbon nanohorns, lithium magnesium imides, and zirconium beryllium hydrides), to measure hydrogen uptake by solid proton conductors, and to characterize stoichiometries of Nafion films used as membranes in fuel cells. Future upgrades to the instrument will improve detection limits, applicability, and user interface.

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