ENVIRONMENTAL INSTRUMENTATION FOR IN SITU RADIONUCLIDE ASSAY L. E. Bruns Rockwell Hanford Operations Richland, Washington ABSTRACT To adequately characterize and note the movement of radionuclides with time in the Hanford Waste Management Complex, environmental in-field and tn sttu instruments are being developed by Rockwell Hanford Operations. The instruments should be invaluable both from a cost and adequate coverage standpoint. Several field systems have been fabricated for assaying the radionuclides using beta, gamma, neutron, alpha, and X-ray radiation. Others are in the process of being developed or in the planning stage. INTRODUCTION An advantage of working with radionuclides is the ability to in sttu detect very small quantities, amounts below that which is harmful to man. For waste management of radionuclides at Hanford near Richland, Washington, public protection assurance can be enhanced today and in the future by use of environmental tn sttu instruments that can quantify very low to high levels of radionuclides rapidly and inexpensively. This presentation includes advantages of tm sttu instruments, the programs being pursued by Rockwell Hanford Operations, and future work. Rockwell personnel proposed an environmental instrumentation program in 1973 (Bruns, 1973). This proposal included several mobile vans and other portable systems. Since 1973, temporary mobile equipment was tested and used, available instrumentation was adapted to radionuclide characterization, two van systems have been developed and fabricated, and new concepts have been devised. 697