1. CEA, DEN, DEC, Cadarache F-13108 Saint-Paul-Lez-Durance, France
2. Helmholtz Zentrum Dresden-Rossendorf (HZDR), Institute of Resource Ecology,
P.O. Box 510119, 01314 Dresden, Germany, and Rossendorf Beamline at ESRF, BP 220, F-38043 Grenoble, France