A PROPOSED BENCHMARK PROBLEM FOR SCATTER CALCULATIONS IN RADIOGRAPHIC MODELLING
- Bundesanstalt fuer Materialforschung und-pruefung, Unter den Eichen 87, 12205 Berlin (Germany)
- Electricite de France R and D, 1 avenue du general de Gaulle, 92141 Clamart (France)
- CEA, LETI, MINATEC, F38054 Grenoble (France)
- INSA-Lyon, Laboratoire de Controle Non Destructif par Rayonnements Ionisants Bat Saint Exupery, 20 avenue Albert Einstein 69 621 Villeurbanne Cedex (France)
Code Validation is a permanent concern in computer modelling, and has been addressed repeatedly in eddy current and ultrasonic modeling. A good benchmark problem is sufficiently simple to be taken into account by various codes without strong requirements on geometry representation capabilities, focuses on few or even a single aspect of the problem at hand to facilitate interpretation and to avoid that compound errors compensate themselves, yields a quantitative result and is experimentally accessible. In this paper we attempt to address code validation for one aspect of radiographic modeling, the scattered radiation prediction. Many NDT applications can not neglect scattered radiation, and the scatter calculation thus is important to faithfully simulate the inspection situation. Our benchmark problem covers the wall thickness range of 10 to 50 mm for single wall inspections, with energies ranging from 100 to 500 keV in the first stage, and up to 1 MeV with wall thicknesses up to 70 mm in the extended stage. A simple plate geometry is sufficient for this purpose, and the scatter data is compared on a photon level, without a film model, which allows for comparisons with reference codes like MCNP. We compare results of three Monte Carlo codes (McRay, Sindbad and Moderato) as well as an analytical first order scattering code (VXI), and confront them to results obtained with MCNP. The comparison with an analytical scatter model provides insights into the application domain where this kind of approach can successfully replace Monte-Carlo calculations.
- OSTI ID:
- 21260284
- Journal Information:
- AIP Conference Proceedings, Vol. 1096, Issue 1; Conference: 35. annual review of progress in quantitative nondestructive evaluation, Chicago, IL (United States), 20-25 Jul 2008; Other Information: DOI: 10.1063/1.3114195; (c) 2009 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); ISSN 0094-243X
- Country of Publication:
- United States
- Language:
- English
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