At the National Institute of Laser, Plasma and Radiation Physics (NILPRP) Association Euratom-MEC in Bucharest (Romania) a laboratory for microtomography was established during 2001-2002 with European Community support (EFDA Newsletter, Vol. 2003/2, April 5, 2003). Its research is focused on the project ”Non-destructive analysis of fusion materials samples by X-ray microtomography” and aims at the improvement of developing and testing of fusion materials by employing state of the art non-destructive techniques (NDT).
X-ray-tomography as an NDT tool for fusion material samples can provide information on:
• density variations
• visualization of micro-cracks developed by mechanical/thermal cycling
• permeability and pore network connectivity in porous materials
• microstructure integrity of various components
• accurate geometrical measurements in 3-D

Computer-aided tomography systems (figure below) are configured to take many views of the object in order to build a 3-D model of its internal structure. 2-D slices through this volume can be viewed as images, or the 3-D volume may be rendered, sliced, and measured directly.

For the NDT inspection of individual miniaturised samples the microtomography analysis is guaranteed for feature recognition down to a few microns. In order to examine flat components, a computed laminography function was recently added. In this case objects are imaged from an oblique direction with respect to the rotational axis to overcome some of the disadvantages of the conventional CT systems and ensures large magnification of the region of interest.

3-D tomographic reconstructions are obtained by a proprietary highly optimized computer code based on a modified Feldkamp algorithm. Beam hardening artefacts, the most challenging problem in high density materials inspection, are reduced by a correction method based on X-ray spectrum filtering and the linearization of the transmission curve.

The microtomographic facility is available for the EFDA Technology Workprogramme. The activities will be focussed on implementation of suitable NDT inspection methods for the structural integrity assessment of instrumented capsules and rigs by microtomography and experimental validation of real time micro-radiography of miniaturized samples under mechanical stress.

Overall performances
Magnification < 2000
Spatial Resolution ≅ 10μm
Density Resolution > 0.5%
3-D Reconstruction Time
≅ 5min.
(512 x 512x 256 voxels)
Probe Dimensions
Diameter < 40 mm
Height < 500 mm

For more information

Institute of Atomic Physics

Any questions on microtomography?

Dr. I. Tiseanu
E-mail contact: