Estimating the correlation length of inhomogeneities in a polycrystalline material Igor Simonovski * , Marko Kovač, Leon Cizelj Jožef Stefan Institute, Reactor engineering division, Jamova 39, 1000 Ljubljana, SI- Slovenia * Corresponding author: Tel.: +386-1-5885290 Fax: +386-1-5612335 E-mail: igor.simonovski@ijs.si 1