COMPARISON OF ATTENUATION CORRECTION METHODS FOR TGS AND SGS: DO WE REALLY NEED SELENIUM-75?

We compared DO WE REALLY NEED SELENIUM-75? R. J. Estep, T. H. Prettyman, and G. A. Sheppard Los Alamos National Laboratory Los Alamos, New Mexico USA attenuation-coefficient mapping techniques for use in tomographic gamma scanner (TGS) image reconstructions to determine whether there is a significant improvement when using fully coupled methods. For the constrained least-squares image reconstruction method tested here, we found no significant improvement. We also compared the effectiveness of different transmission source combinations for 129- and 4 14-keV 239PuTGS assays. We concluded that the best source combination for TGS assays of 239Puand other isotopes is a mixture of ‘33Ba,54Mu,and CoCo. Three other source combinations were found to beat least as effective as ‘sSe.