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The accuracy of density measurements and position resolution in flash (40 ns) radiography of thick objects with 24 Gev/c protons is investigated. A global model fit to step wedge data is shown to give a good description spanning the periodic table. The parameters obtained from the step wedge data are used to predict transmission through the French Test Object (FTO), a test object of nested spheres, to a precision better than 1%. Multiple trials have been used to show that the systematic errors are less than 2%. Absolute agreement between the average radiographic measurements of the density and the known density is 1%. Spatial resolution has been measured to be 200 μm at the center of the FTO. These data verify expectations of the benefits provided by high energy hadron radiography for thick objects.

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The energy dependence of a relativistic optical model potential consisting of a mixture of Lorentz scalar and Lorentz vector components is determined from the analysis of p -Ca elastic scattering experiments from 26 to 1040 MeV. NUCLEAR REACTIONS Dirac equation based analysis of p-Ca elastic scattering, E~= 26 to 1040 MeV. Energy dependence of empirical relativistic optical potential.