ADVANTAGES OF IN SITU INSTRUMENTATION Waste Management Data Base requirements that can be fulfilled by tn sttu instruments are: location of contaminated zones; measurement of types, concentrations, and amounts of radionuclides and other toxic substances; movement with time of toxic substances; and measurement of matrix parameters such as void volume, gas buildup due to radiolysis, density, porosity, moisture content, and elemental assay. Advantages of tn situ instruments over field sampling, laboratory sample preparation, and analyses are: larger “sample” size; sample more representative; improved statistics; cost reductions by 5-10 fold; results in minutes versus days, months; only method known for estimating toxic substance concentrations in heterogeneous matrices; better cost effective method for determining movement of toxic substances with time; can better detect abnormalities (e.g., smear); and better method for emergency situations where rapid assays are required. ROCKWELL PROGRAM The following instruments and what they will do constitutes Rockwell's current program. 698