Results 241 to 250 of about 94,653 (297)
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Metallurgical Reviews, 1962
AbstractIn Recent Years there has been an increasing demand for materials of very high purity for uses on an industrial as well as a laboratory scale. This has provided an impetus to the development of analytical methods for the determination of minute quantities of impurities.
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AbstractIn Recent Years there has been an increasing demand for materials of very high purity for uses on an industrial as well as a laboratory scale. This has provided an impetus to the development of analytical methods for the determination of minute quantities of impurities.
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Neutron activation in interrupted neutron beams
Applied Radiation and IsotopesNeutron activation of activation targets in neutron beams with interruptions is studied. A simple and robust formalism for determining the number of activated atoms in neutron activation measurement despite beam interruptions is derived. Two simplified methods for correcting for the decay of produced nuclei in the activation target during beam ...
Wendland Lauri +7 more
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Neutron Activation Analysis with Low Neutron Flux
IEEE Transactions on Nuclear Science, 1986Procedures are described for identifying and determining concentrations of trace impurities in minerals by means of neutron activation analysis with low neutron flux and standard gamma measurement equipment. Techniques developed in this work may be of use to those involved with the ever increasing need for mineral assays and for pollutant measurements,
M. Nomai +2 more
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Neutron Activation Data for Neutron Interrogation
AIP Conference Proceedings, 2005Various schemes have been proposed for neutron interrogation of packages, luggage, or containers with the intent of locating concealed contraband items such as conventional explosives, drugs, or restricted special nuclear materials. Relatively intense and energetic neutron sources are usually required in these applications in order to penetrate the ...
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Neutron flux uniformity in in vivo neutron activation analysis
Physics in Medicine & Biology, 1976Horowitz et al. (see ibid., vol.21, p.306, 1976), have recently criticized published work on in vivo neutron activation analysis for an implicit assumption that radiative capture cross-sections are everywhere negligible except at thermal energies, and have stated that this has led to undue emphasis being placed on thermal neutron flux uniformity in ...
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Ignitor neutronics and activation
Fusion Engineering and Design, 1996Abstract The neutron and gamma fluxes in all the main components of the projected Ignitor tokamak are calculated and discussed. The results are obtained using the 3-D Monte Carlo code mcnp with a detailed description of the device geometry and an accurate representation of the neutron source. The neutron-induced radioactivity, contact dose rates, and
Batistoni P. +3 more
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Journal of Radioanalytical and Nuclear Chemistry, 2005
Dubbed “Analyzer” because of its simplicity, a neutron activation analysis facility for short-lived isomeric transitions is based on a low-cost rabbit system and an adaptive digital filter which are controlled by a software performing irradiation control, loss-free gamma-spectrometry, spectra evaluation, nuclide identification and calculation of ...
G. P. Westphal +5 more
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Dubbed “Analyzer” because of its simplicity, a neutron activation analysis facility for short-lived isomeric transitions is based on a low-cost rabbit system and an adaptive digital filter which are controlled by a software performing irradiation control, loss-free gamma-spectrometry, spectra evaluation, nuclide identification and calculation of ...
G. P. Westphal +5 more
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Neutron Activation Autoradiography
2016Autoradiography uses a photographic film or imaging plate which are placed in direct contact with a painting after irradiation by slow neutrons. The pigments become radioactive after the interaction with the neutron beam and the emitted radiation (gammas, X-rays and electrons, so called beta-rays) is registered in the film or plate.
A. Denker +2 more
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Neutron activation and analyses
EUREL International Conference. The Detection of Abandoned Land Mines: A Humanitarian Imperative Seeking a Technical Solution, 1996Detection of abandoned land mines is a difficult problem. The only true mine detection systems in the inventory are based on visible and infra-red observation, on metal detection, on microwave detection, and on nuclear techniques. Each of these systems is able to detect a mine from one of its characteristics, i.e. presence of antennas or trigger wires,
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2019
Active neutron spectrometer for measuring energy spectrum of neutron field, has polyhedral moderator housing with channel that extends in direction going from center to center of flat face and opens onto flat face of high atomic ...
A. POLA, S. PASQUATO, D. RASTELLI
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Active neutron spectrometer for measuring energy spectrum of neutron field, has polyhedral moderator housing with channel that extends in direction going from center to center of flat face and opens onto flat face of high atomic ...
A. POLA, S. PASQUATO, D. RASTELLI
openaire +1 more source