Year
1974
Abstract
The Isotopic Source Assay System (ISAS) utilizes the detection of the multiplicity of fission events to quantitatively measure the fissile content of fuels and scrap materials. Advantages obtained through the use of this nondestructive system include stability, sensitivity, and ease of operation. The upgrading of the ISAS has been essentially an advancement in its stability or its selectivity, i.e., the development of a technique for measuring pseudofission events arising from a variety of sources. Once these events have been measured they can be handled as backgrounds in a conventional manner, thus broadening the domain of ISAS applicability and increasing its precision.