Nondestructive measurement of the passive neutron sig¬ natures of irradiated light-water reactor fuel assemblies is a rapid and simple technique for verifying operatordeclared exposure values. Fuel assemblies from four differ¬ ent reactor facilities have been measured to establish the functional relationship between the operator-declared ex¬ posure values and the experimentally measured neutron emis¬ sion rates. Experimentally measured neutron emission rates of small fuel rod sections have been shown to agree with the predicted results from our calculational model. Destructive results for the actinide isotopes also agreed very well with our prediction. Neutron emission rates varied by 30 to 40% between opposite corners of the source fuel assembly. Sym¬ metrical neutron detector systems that measure all sides simultaneously were evaluated. whereas the Cm chain goes 241 Pu 242 Pu 243 Am-• 243 Pb ojp 244 *Both Am and Am have metastable states.

Los Alamos National Laboratory. an affirmative actionlequal opportunity empldyer. is operated by the University of California for the US. Department of Energy under contract W-74Q5-ENG-36. By acceptance of this article, the publisher recognizes that the U.S. Government retains a nonexclusive, royalty-free license to publish or reproduce the published form of this contribution, or to allow others to do so, for US. Government purposes. The Los Alamos Nati nal Laboratory requests that the publisher identify this article as work performed under the auspices of the US. Department of Energy. F m No. 836 R5 & ST262910191 pgn.guTi,qN af Ti.%. Q~~.GJ~E.KT !s. IJNLINIITEQ

The objective of the Pion Generation for Medical Irradiations (PIGMI) program at the Los Alamos Scientific Laboratory is to develop the technology to build smaller, less expensive, and more reliable proton linear accelerators for medical applications. For this program, we developed a powerful, simple, inexpensive, and reliable control and data acquisition system. The system has a NOVA 3D computer with a real time diskoperating system (RDOS) that communicates with distributed microprocessor-based controllers which directly control data input/output chassis. At the heart of the controller is a microprocessor crate which was conceived at the Fermi National Accelerator Laboratory. We applied this idea to the design of the hardware and software of the controller. •OMNIBYTE Corp.,

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