Webbläsaren som du använder stöds inte av denna webbplats. Alla versioner av Internet Explorer stöds inte längre, av oss eller Microsoft (läs mer här: * https://www.microsoft.com/en-us/microsoft-365/windows/end-of-ie-support).

Var god och använd en modern webbläsare för att ta del av denna webbplats, som t.ex. nyaste versioner av Edge, Chrome, Firefox eller Safari osv.

The energy-selective option in neutron imaging

In English

Författare

  • E. H. Lehmann
  • G. Frei
  • P. Vontobel
  • L. Josic
  • N. Kardjilov
  • A. Hilger
  • W. Kockelmann
  • Axel Steuwer

Summary, in English

In the past, neutron imaging investigations have been mostly performed in "integrating mode", which averages over the full applied neutron energy spectrum. This article describes four different methods and devices of obtaining energy selectivity in the thermal to cold energy range, which allow a new approach in neutron imaging. Two principles have been used and tested: (a) selection of neutrons by suppression of contribution of other spectral parts; (b) using the flight-time information in distance from the source. For the (a) option, three different devices have been exploited practically. Information about material properties can be revealed that cannot be obtained in integrating mode. The energy-dependent transmission measurements make use of the Bragg edges in the total cross-sections of materials. Energy-selective radiography has vast potential for contrast variation, and for mapping structural properties such as crystallographic texture and residual strains with high spatial resolution. The obtained images highlight new opportunities in materials and engineering research, in comparison and complementary to what can be obtained by neutron scattering. There is likely to be an increasing need for implementing time-of-flight neutron imaging at present and future pulsed spallation sources, where the energy range can be selected almost without limitations. In this paper we attempt to give an overview over the current state of the art of energy-selective imaging and the experimental configurations required. (C) 2009 Elsevier B.V. All rights reserved.

Publiceringsår

2009

Språk

Engelska

Sidor

429-438

Publikation/Tidskrift/Serie

Nuclear Instruments & Methods in Physics Research. Section A: Accelerators, Spectrometers, Detectors, and Associated Equipment

Volym

603

Issue

3

Dokumenttyp

Artikel i tidskrift

Förlag

Elsevier

Ämne

  • Accelerator Physics and Instrumentation

Nyckelord

  • Neutron imaging
  • Energy selection
  • Bragg edges
  • Transmission
  • Pulsed spallation source
  • Welding

Status

Published

ISBN/ISSN/Övrigt

  • ISSN: 0167-5087