New PDF release: 40.Nuclear Science

By John G. Webster (Editor)

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To get some feeling of the energies involved, the energy of a 1 GHz radio wave photon is 4 ȐeV. 5 eV. Thus, radio waves and visible light are not ionizing radiation, and ionization chambers are not suitable for detecting them. X rays and gamma rays are, however, ionizing. The ionization may occur through one of three processes: the photoelectric effect, Compton scattering, or pair production. The dominant process depends on the energy of the photon. The electrons produced in the primary ionization event then lose their kinetic energy through ionization of the gas in the chamber.

Again definitive qualification tests are required before application of the materials for making components to be used in the next-step device. Once those tests are completed, testing of the components integrated into a complete instrument will be highly desirable. Nuclear radiation also drastically affects the transmission of transparent optical components such as windows, lenses, and fiber optics as well as causing fluorescence (27,39). The FUSION REACTOR INSTRUMENTATION latter tends to be a more serious issue in fiberoptics because of the much greater length of transmission medium.

It is hoped that with better understanding of the details of the plasma behavior, it will be possible to greatly reduce the instrumentation demands for fusion reactor operation. There are many challenges associated with creating a fusion reactor. Among them is the provision of a capable set of instrumentation. There is every reason to think that this instrumentation will evolve with the fusion program, and many of the detailed problems apparent now will be resolved with further research and development.

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40.Nuclear Science by John G. Webster (Editor)


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