Proton Radiography

Details Proton Radiography Proton Radiography

Apr 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002aps..apr.c6005m&link_type=abstract

American Physical Society, April Meeting, Jointly Sponsored with the High Energy Astrophysics Division (HEAD) of the American As

Astronomy and Astrophysics

Astrophysics

Scientific paper

Current developments in proton radiography are described. High energy protons will penetrate dense objects, suffering energy loss, nuclear attenuation, and multiple coulomb scattering in the process. A magnetic lens after the object refocuses the scattering angle distribution to produce a radiographic image. A time sequence of such images, providing a movie of a dynamic event, may be produced using a series of proton pulses from the accelerator. A special correlation in the illuminating beam removes a significant part of the chromatic aberration blur in the image, and provides a Fourier point in the center of the lens where the transmitted rays are sorted by scattering angle. A second lens with a collimator at its Fourier point provides a second data image that may be used to identify the elemental composition encountered on the path to each pixel. The theory of these lens systems is described, using as examples the operational facility at LANSCE (Los Alamos), the experiment at the AGS (Brookhaven), and the proposed Advanced Hydrotest Facility (AHF). Beam distribution systems to provide multiple view directions for tomographic reconstruction of interior densities are also described.

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