High Resolution Neutron Resonance Absorption Imaging at a Pulsed Neutron Beamline
| Autor: | Jason B. McPhate, Erik Schooneveld, John V. Vallerga, Anton S. Tremsin, Winfried Kockelmann, Nigel J. Rhodes, Oswald H. W. Siegmund, W. Bruce Feller |
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| Rok vydání: | 2012 |
| Předmět: |
Physics
Bonner sphere Nuclear and High Energy Physics business.industry Neutron stimulated emission computed tomography Neutron temperature Neutron spectroscopy Neutron capture Nuclear magnetic resonance Optics Nuclear Energy and Engineering Neutron source Neutron detection Neutron Electrical and Electronic Engineering Nuclear Experiment business |
| Zdroj: | IEEE Transactions on Nuclear Science. 59:3272-3277 |
| ISSN: | 1558-1578 0018-9499 |
| Popis: | The existence of resonance peaks in neutron absorption spectra in the epithermal range of energies enables unique non-destructive testing techniques. The deep penetration of epithermal neutrons provides the opportunity to perform a compositional analysis of a sample which is opaque to X-rays and thermal neutrons. The neutron resonances in the transmission spectra constitute a characteristic pattern for many isotopes, which can be used to identify the isotope and to map the distribution of the isotope in a sample. The neutron transmission spectra can be measured with the time of flight (TOF) technique using a pulsed neutron source. Combining this method with a high resolution neutron counting detector enables substantial improvements of spatial resolution of neutron resonance transmission imaging. Such a detector has been developed to register neutrons with 55 µm spatial and 10–1000 ns temporal resolution Our proof-of-principle experiments at the ISIS pulsed neutron spallation source demonstrate that compositional analysis of multi-element samples can now be performed with ∼150 µm spatial resolution. Images of a test mask consisting of |
| Databáze: | OpenAIRE |
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