National Institute of Standards & Technology, Acquisition & Assistance Division, Bldg. 301, Rm. B117, Gaithersburg, Md

68 -- SODIUM IODIDE CRYSTAL ANNULUS SPIKED WITH THALLIUM SOL 52SBNB6C9170 DUE 062896 POC Sandra Febach (301) 975-6326, FAX (301) 963-7732 The National Institute of Standards and Technology (NIST) has a requirement for a specially manufactured high purity sodium iodide (NaI) crystal annulus spiked with thallium (Tl), hereafter designated as NaI(Tl), designed for the following applications: i) high efficiency cosmic-ray and secondary gamma-ray detector (active shield) for background reduction of miniature-proportional and Geiger Muller radioactivity detectors for high precision measurments of radioactive nuclides and ii) Compton-suppression gamma spectroscopy using a High-Purity Germanium (Ge) detector (Ge detector is not a component of this procurement) in coincidence with the NaI(Tl) crystal for optimal suppression of the Compton background capable of yielding peak-to-Compton ratio levels comparable to that reported in the literature (ca. 800:1) depending on the HPGe detector used and the system configuration. The NaI(Tl) annulus system and associated electronics shall be manufactured in strict accordance with specifications to be included with the Request for Proposals (RFP). Delivery will be FOB destination to Gaithersburg, MD, within six (6) months after contract award. It is anticipated that the type of contract will be firm-fixed-price. All responsible sources may submit an offer, which will be considered by the agency. All requests for the solicitation must be in writing, but may be telefaxed to (301) 963-7732. See Numbered Note 26. (0135)

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