National Institute of Standards and Technology, Acquisition and Assistance Division, Bldg. 301, Room B117, Gaithersburg, MD 20899

44 -- NEUTRON GUIDES SOL 52SBNB6C9027 POC Joan Smith (301) 975-6458, Pauline Mallgrave (301) 975-6330 The U.S. Department of Commerce, National Institute of Standards and Technology (NIST), Reactor Radiation Division has a requirement for fabrication of neutron guides needed for the Cold Neutron Research Facility (CNRF), to be procured under an indefinite delivery indefinite quantity contract. NIST'S requirement is for the supply of neutron guides of varying cross-sections and lengths, fabricated of different materials and coated with different elements. Guide materials are required to be ''bokron'' glass, float glass, or silicon; coatings are required to be Ni-58 or coatings providing at least two times the critical angle of reflection of normal Ni. All guides are required to be furnished with external mirrors for alignment (autocollimation). Specific requirements are: (1) Construction - All guide elements are to be machined and glued according to the Governments specifications; (2) Reflectivity - All guides made with Ni-58 or its equivalent are required to possess a reflectivity of at least 99 percent (average value between zero and the critical angle). All guides made with critical angles twice, or greater, than that of normal nickel are required to possess a reflectivity greater than 95 percent. The corresponding substrates shall be polished to provide the required reflectivities; (3) Stability - The coatings are required to show no degradation in performance in temperatures up to 100 degrees Centigrade, or in radiation fields (neutron and gamma) to which the neutron guides are typically exposed; and (4) Adhesion - The coatings are required to be permanently bonded to the glass substrates with sufficient adhesion to resist removal by Scotch tape (3M brand #810). It should be noted that CILAS, possesses a number of special fixtures for aligning and gluing the guides. This equipment was specifically designed to fit CILAS' specialized equipment, and cannot be used elsewhere unless extensive modifications were made. -- Period of Performance is from the Date of Contract Award through twelve months thereafter with two one year options to renew. -- See Numbered Note 22 -- It is the Government's intent to negotiate with Compagnie Industrielle des Lasers (CILAS), France, the only responsible source that can satisfy the agency's requirements. (0303)

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