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Special Features in Radiography Accessed by 3D Monte Carlo Model

  • Standard radiography simulators are based on the attenuation law complemented by built-up-factors (BUF) to describe the interaction of radiation with material. The assumption of BUF implies that scattered radiation reduces only the contrast in radiographic images but does not image object structures itself. This simplification holds for a wide range of applications 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 others that every radiographer has experienced in practice. The application of the N-Particle Monte Carlo code MCNP is capable to handle primary and secondary interaction mechanisms contributing to the image formation process like photon interactions (absorption, incoherent and coherent scattering including electron-binding effects, pair production) and electron interactions (electron tracing including X-Ray fluorescence and BremsstrahlungStandard radiography simulators are based on the attenuation law complemented by built-up-factors (BUF) to describe the interaction of radiation with material. The assumption of BUF implies that scattered radiation reduces only the contrast in radiographic images but does not image object structures itself. This simplification holds for a wide range of applications 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 others that every radiographer has experienced in practice. The application of the N-Particle Monte Carlo code MCNP is capable to handle primary and secondary interaction mechanisms contributing to the image formation process like photon interactions (absorption, incoherent and coherent scattering including electron-binding effects, pair production) and electron interactions (electron tracing including X-Ray fluorescence and Bremsstrahlung production). Additionally 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 intends to discuss the opportunities in applying the Monte Carlo method to investigate special features in radiography in terms of selected examples. It is important to note that the use of Monte Carlo methods is a laboratory type of technique for basic investigations because of the enormous computing power that is needed. For in-field applications such as for inspection planing simplified models are of much greater importance and increasingly in use. ©2003 American Institute of Physicszeige mehrzeige weniger

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Metadaten
Autor*innen:Gerd-Rüdiger Jaenisch, Carsten BellonORCiD
Persönliche Herausgeber*innen:D. O. Thompson
Dokumenttyp:Beitrag zu einem Tagungsband
Veröffentlichungsform:Verlagsliteratur
Sprache:Englisch
Titel des übergeordneten Werkes (Englisch):Review of progress in quantitative nondestructive evaluation, volume 22
Jahr der Erstveröffentlichung:2003
Verlag:American Institute of Physics
Verlagsort:Melville, NY
Erste Seite:537
Letzte Seite:544
Veranstaltung:29th Annual Review of Progress in Quantitative Nondestructive Evaluation
Veranstaltungsort:Bellingham, WA, USA
Beginndatum der Veranstaltung:2002-07-14
Enddatum der Veranstaltung:2002-07-19
DOI:10.1063/1.1570183
ISSN:0743-0760
ISSN:0094-243X
ISBN:0-7354-00117-9
Bemerkung:
Geburtsname von Jaenisch, Gerd-Rüdiger: Tillack, G.-R. -  Birth name of Jaenisch, Gerd-Rüdiger: Tillack, G.-R.
Verfügbarkeit des Dokuments:Physisches Exemplar in der Bibliothek der BAM vorhanden ("Hardcopy Access")
Bibliotheksstandort:Sonderstandort: Publica-Schrank
Datum der Freischaltung:19.02.2016
Referierte Publikation:Ja
Datum der Eintragung als referierte Publikation:24.11.2003
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