Radiography apparatus using gamma rays emitted by water activated by fusion neutrons Page: 4 of 34
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techniques applicable to various objects including the human
body. Since the time of Roentgen, this method has developed
enormously and now finds routine application in practically
every aspect of modern life, e.g., manufacturing,
construction, quality control, medicine, defense,
transportation, security and basic and applied research.
The fundamental principles of photon radiography
are well known and widely described in the literature. The
most widely used approach involves X-rays in the range of a
10 few keV to several hundred keV that are produced at
relatively low cost by electron bombardment of medium to
high atomic number metals in sealed, evacuated X-ray tubes.
While this approach is extremely versatile, there are limits
based on the penetrating capacity of these photons and on
attainable source intensities. Photons with higher energies
and source intensities can be obtained from radioactive
gamma-ray sources, e.g., 6Co (or 137Cs) and from electron
accelerators such as linacs and synchrotons. Radioactive
sources are difficult to handle and store safely. Also, the
20 range of geometric configurations that are possible with
these materials is somewhat limited, mainly due to safety
considerations. Accelerator sources are capable of
producing very high radiation intensities and relatively
high photon energies, but like X-ray tubes, they involve
continuous energy photon spectra. These machines are also
generally rather costly to build and operate. Because
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Smith, D. L.; Ikeda, Yujiro & Uno, Yoshitomo. Radiography apparatus using gamma rays emitted by water activated by fusion neutrons, patent, December 31, 1995; Illinois. (https://digital.library.unt.edu/ark:/67531/metadc694716/m1/4/: accessed April 23, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.