Nuclear Reaction Analysis (NRA) (Computers - Information Technologies)
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Item ID 15306066 in Category: Computers - Information Technologies
Nuclear Reaction Analysis (NRA) | |
Nuclear Reaction Analysis (NRA) Nuclear reaction analysis (NRA) is an analytical method used for quantifying and depth profiling of some light elements and isotopes in the surface and near surface regions of solid materials. In the NRA technique, an ion beam using light projectile nuclei of known mass and energy, impinges upon nuclei of the target element at incident energy levels exceeding the coulomb barrier of the target. This results in nuclear reactions between the incident ions and the target nuclei, yielding light and heavy nuclear reaction products with different energy levels, emitted at different angles. The energy level of the reaction products depends upon the incident ion mass and energy, the target atomic mass, product emission angles, masses of light and heavy reaction products and the energy released in the nuclear reaction. The emitted particles are detected by solid state detectors and energy spectra are produced, from which the target elements in the sample can be quantified. The incident ions used in NRA are protons (1H), deuterons (2H), 3He or alpha particles (4He). Interference from backscattered particles can be eliminated using absorber foils to filter out the interference, based on the relatively higher energy of nuclear reaction products. Due to the isotope-specific nature of nuclear reactions, NRA can be used for isotope identification and mapping. However, for a given incident ion species and energy, only one (or a few) isotopes can be detected, so several repetitions would be needed with varying energy levels or incident ion species for complete analysis. Depth profiling to obtain concentration variation of a specific isotope can be done by non-resonant NRA or resonant NRA, depending upon the reaction cross section of the sample.  | |
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| Target State: New Jersey Target City : Newark Last Update : Jul 28, 2023 11:49 AM Number of Views: 86 | Item Owner : Infinita lab Contact Email: Contact Phone: 088887 83090 |
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2024-04-28 (0.221 sec)