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1 November 1997 Radiographic tomography using near-monochromatic gamma rays
Eric C. Schreiber, Patrick G. O'Shea
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Proceedings Volume 3154, Coherent Electron-Beam X-Ray Sources: Techniques and Applications; (1997) https://doi.org/10.1117/12.293365
Event: Optical Science, Engineering and Instrumentation '97, 1997, San Diego, CA, United States
Abstract
We describe a new radiographic technique using quasi- monochromatic (gamma) -rays. Conventional radiography of dense or thick objects is severely limited by the broad energy spread of bremsstrahlung (gamma) -rays. The development of intense, tunable, near-monochromatic (gamma) - rays sources in the 4-30 MeV range affords the opportunity to develop a new type of radiographic tomography. Such (gamma) -rays will shortly be available from inverse Compton free-electron laser sources. The expected narrow energy spread and energy tunability will allow not only the structure and distribution of material in an object to be determined but also the specific elemental composition of the material. This is because each element has a slightly different absorption cross section minimum. Furthermore, the quasi-monochromatic nature of the incident (gamma) -ray beam will allow discrimination between scattered and unscattered photons exiting the test object, and result in reliable composition and density data. In this paper, we present an overview of the radiographic process and some early computer simulation results.
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Eric C. Schreiber and Patrick G. O'Shea "Radiographic tomography using near-monochromatic gamma rays", Proc. SPIE 3154, Coherent Electron-Beam X-Ray Sources: Techniques and Applications, (1 November 1997); https://doi.org/10.1117/12.293365
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KEYWORDS
Photons
Tomography
Absorption
Scattering
Laser scattering
Particles
Signal attenuation
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