Monte Carlo simulation for radiographic applications.
Monte-Carlo-Simulation für radiographische Anwendungen - Verbesserung der quantitativen Vorhersage von Durchstrahlungsaufnahmen
Gerd-Rüdiger Tillack und Carsten Bellon
ABSTRACT Standard radiography simulators are based on the attenuation law complemented by built-up-factors (BUF) to describe the interac-tion of radiation with material. The assumption of BUF implies that scattered radiation reduces only the contrast in radiographic images. This simplification holds for a wide range of applica-tions like weld inspection as known from practical experience. But only a detailed description of the different underlying interaction mechanisms is capable to explain effects like mottling or oth-ers that every radiographer has experienced in practice. The application of Monte Carlo models is capable to handle primary and secondary interaction mechanisms contributing to the image formation process like photon interactions (absorption, incoherent and coherent scattering in-cluding electron-binding effects, pair production) and electron interactions (electron tracing in-cluding X-Ray fluorescence and Brems-strahlung production). It opens up possibilities like the separation of influencing factors and the understanding of the functioning of intensifying screen used in film radiography. The paper discusses the opportunities in applying the Monte Carlo method to investigate special features in radiography in terms of selected examples.
Publication Source: Materialprüfung, ISSN: 0025-5300
Issue: 2003-3, pp 85-91
Publisher: Carl Hanser Verlag München
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