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Positron Emission Tomography01:29

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Positron emission tomography (PET) is a medical imaging technique involving radiopharmaceuticals — substances that emit short-lived radiation. Although the first PET scanner was introduced in 1961, it took 15 more years before radiopharmaceuticals were combined with the technique and revolutionized its potential.
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Irradiation of a spin-active nucleus causes an increase or decrease in the signal intensity of neighboring nuclei that are not necessarily chemically bonded or involved in J-coupling.  This phenomenon, called the Nuclear Overhauser Enhancement (NOE), results from through-space interactions between the nuclear spins. The NOE effect decreases with increasing internuclear distance and is generally not observed beyond 4 angstroms. In NOE, dipole-dipole interactions between neighboring...
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Imaging Studies II: Positron Emission Tomography and Scintigraphy01:25

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Positron Emission Tomography (PET) is a medical imaging technique that provides crucial insights into the body's physiological functions at a molecular level. It is an indispensable resource for diagnosing, staging, and monitoring various illnesses, notably cancer, neurological disorders, and cardiovascular conditions.
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Nuclear Transmutation03:20

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Nuclear transmutation is the conversion of one nuclide into another. It can occur by the radioactive decay of a nucleus, or the reaction of a nucleus with another particle. The first manmade nucleus was produced in Ernest Rutherford’s laboratory in 1919 by a transmutation reaction, the bombardment of one type of nuclei with other nuclei or with neutrons. Rutherford bombarded nitrogen-14 atoms with high-speed α particles from a natural radioactive isotope of radium and observed...
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Insensitive Nuclei Enhanced by Polarization Transfer (INEPT) is an advanced Nuclear Magnetic Resonance (NMR) technique specifically designed to detect and enhance the signals of low-abundance nuclei, such as carbon-13 and nitrogen-15, in small molecules. The fundamental principle behind INEPT is the transfer of polarization from a more abundant and highly polarizable nucleus, typically hydrogen-1, to the low-abundance nucleus of interest. This process effectively boosts the NMR signal of the...
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Updated: Jun 24, 2025

Neutron Radiography and Computed Tomography of Biological Systems at the Oak Ridge National Laboratory's High Flux Isotope Reactor
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Operando Neutron Imaging.

Marin Nikolic1, Alessia Cesarini2, Ali J Saadun3

  • 1Empa Dübendorf, CH-8600 Dübendorf. marin.nikolic@empa.ch.

Chimia
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Summary
This summary is machine-generated.

Neutron imaging, despite its simplicity, is crucial for studying complex chemical processes in harsh conditions. This technique is advancing as a powerful chemical imaging method for energy technologies.

Keywords:
CatalysisElectrochemistryFuel cellsNeutron imagingPower-to-X

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Area of Science:

  • Materials Science
  • Chemistry
  • Physics

Background:

  • Neutron imaging is often overlooked compared to neutron spectroscopy.
  • Its apparent simplicity enables unique applications.

Purpose of the Study:

  • To review the application of neutron imaging in modern energy technologies.
  • To highlight its potential as a chemical imaging method.

Main Methods:

  • Review of case studies involving neutron imaging.
  • Analysis of applications in heat storage, power-to-X, batteries, fuel cells, and catalysis.

Main Results:

  • Neutron imaging effectively studies complex chemical and electrochemical processes.
  • It operates well under harsh conditions like high pressure, temperature, and corrosive environments.
  • Promising results were observed across various energy technology case studies.

Conclusions:

  • Neutron imaging is a valuable tool for in-situ analysis of energy devices.
  • The technique shows significant potential for development into a comprehensive chemical imaging method.