Study of Doppler broadening of gamma-ray spectra in 14-MeV neutron activation analysis
| Autor: | P. C. Womble, Alexander Barzilov |
|---|---|
| Rok vydání: | 2014 |
| Předmět: |
Physics
Bonner sphere Astrophysics::High Energy Astrophysical Phenomena Health Toxicology and Mutagenesis Nuclear Theory Neutron stimulated emission computed tomography Public Health Environmental and Occupational Health Neutron scattering Pollution Neutron time-of-flight scattering Analytical Chemistry Nuclear physics Nuclear Energy and Engineering Neutron cross section Neutron source Radiology Nuclear Medicine and imaging Neutron Atomic physics Nuclear Experiment Spectroscopy Doppler broadening |
| Zdroj: | Journal of Radioanalytical and Nuclear Chemistry. 301:811-819 |
| ISSN: | 1588-2780 0236-5731 |
| Popis: | Neutron reactions producing characteristic photons of isotopes are important for nondestructive analysis of materials. Technique to determine the intensity of neutron induced gamma rays by fitting a spectrum with a Gaussian function using detector resolution curves derived from isotopic sources may fail if the peak is Doppler-broadened. This leads to the miscalculation of the area of the peak and, therefore, to misidentification of the material. This work shows that Doppler broadening occurs in the 14-MeV neutron analysis with photons emitted in inelastic scattering reactions on light nuclei with excited states whose lifetimes are much smaller than the time of flight of a recoiling nucleus in the material. It provides groundwork for analysis of gamma ray spectra utilizing detector response functions measured with a 14-MeV neutron source using actual geometry of an active interrogation system. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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