Incoherent neutron-scattering determination of hydrogen content

Theory and modeling

Journal article (2005)
Department
RID/Reactor Instituut Delft (Delft University of Technology) (TU Delft)
Copyright: © 2005 Perego, R.C.; Blaauw, M.; American Institute of Physics
DOI: https://doi.org/doi:10.1063/1.1940141
More Info
expand_more

Published Date

23-06-2005

Reuse Rights

Other than for strictly personal use, it is not permitted to download, forward or distribute the text or part of it, without the consent of the author(s) and/or copyright holder(s), unless the work is under an open content license such as Creative Commons.

Source:

Journal of Applied Physics, 97 (12), 2005

Faculty

Delft University of Technology

Department

RID/Reactor Instituut Delft

Abstract

Hydrogen concentrations of 0 up to 350?mg/kg in a titanium alloy have been determined at National Institute of Standards and Technology (NIST) with neutron incoherent scattering (NIS) and with cold neutron prompt gamma activation analysis. The latter is a well-established technique, while the former was demonstrated earlier at NIST by counting the neutrons scattered under 45° or 60° and establishing a linear relationship between hydrogen concentration and count rate. In this paper, it is shown that the NIS response is complicated by the dependence of the apparent hydrogen scattering cross section on the sample temperature and the hydrogen chemical binding. It is demonstrated that detection of scattered neutrons at two different angles as well as a more complex theoretical approach (i.e., including Monte Carlo modeling with the free-gas model) are required to correctly interpret NIS measurements. As a result, the process of matching standards and samples becomes less critical.

Files

Perego_2005.pdf
(pdf | 0.15 Mb)