SOURCE RECONSTRUCTION FOR ACCIDENTAL RELEASES OF RADIONUCLIDES.

This report gives a short account on recent advances in the regional scale reconstruction of an accidental release of radionuclides. Variational techniques are used in conjunction with the Eulerian dispersion model Polair3D to determine the source of the release. New objective functions that better incorporate prior information on the source are designed and tested using observing system simulation experiment. [ABSTRACT FROM AUTHOR]