U.S. Department of Commerce, NOAA, Central Administrative Support Center, 601 East 12th St., CC32:MLW RM 1756, Kansas City, MO 64106

45 -- WELL-DETECTOR SYSTEM SOL 52WCNR506042MW DUE 060195 POC Mamie Wandick (816) 426-6823 Ext. 237 SUPPLIES SOURCES SOUGHT: The government intends to procure for a germanium well detector system. This system is intended for use by the Great Lakes Environmental Research Laboratory at Ann Arbor, Michigan in determining the content of gamma-emitting radionuclides in environmental samples, particularly lead-210. This nuclide emits a low energy gamma ray (46.5 KeV) which is at the low end of the energy band over which most applicable well-detectors operate. As a result, accurate determination of the activity of this nuclide depends on minimizing electronic noise, particularly that associated with microphonics. The well detector should be a hole-through design and mounted in a 30 liter NPR cryostat with resistive feedback style preamplifier and cable pack. The following criteria will be used to evaluate responses: Evaluation criteria (in descending order of importance; items 1-9 equal): 1) The vendor must be experienced in the manufacture and installation of solid-state nuclear detection equipment, specifically high-resolution gamma detectors for low-level gamma-ray spectroscopy. 2) The system provided must be a true coax, intrinsic germanium well-detector with a usable energy range of 10 keV to 10 MeV. 3) The detector must be of hole-through design, employ anti-microphonic suppression systems, possess a crystal-to-pre-amp lead length of less than 1/2 inch and have a resistive feedback style pre- amplifier. 4) The detector active volume must be greater than 160 cc with a nominal well diameter of 14.5 mm. 5) Length of the well must be sufficient to contain sample of 3.9 (+0.1) cm length wholly within the active volume of the detector. 5) Energy resolution must be less than 2.2 KeV FWHM @ 1.33 MeV and less than 1.3 KeV FWHM at 122 KeV. 6) Detector must be provided with a copper end cap and ultra low-background internal hardware and electronic components. 7) Detector must have an organic, ultra- low background well insert and be mounted in a 30 liter cryostat (NPR configuration) with components out of the line of sight of the crystal. 8) The detector system must be provided with a lead shield designed specifically for NPR low-background circular cylindrical cryostats with a clam-shell type top opening, and consist of 1/2 in thick outer jacket of low-carbon, low cobalt-60 steel, with a 4'' thick bulk shield of virgin lead, contain a graded cadmium and copper interior lining and have a cavity diameter of at least 11 inches and length of at least 16 inches. 9) A steel table must be provided which supports both the shield and detector system. 10) The system provided must be able to operate for years at constant counting efficiency without the need for factory repairs. 11) The vendor must provide on-site assistance for the installation of the system. The proposed contract action is for supplies for which the Government intends to solicit and negotiate with only one source under the authority of FAR 6.302-1. Interested parties may identify their interest and capability by submitting a required qualifications statement. However, all proposals (including responses to the qualifications and capabilities statement items listed above) received within forty-five days after the date of publication of this synopsis will be considered by the Government. Solicitation No 52WCNR506042 will be issued O/A 05/01/95. A determination by the Government not to compete this proposed contract based upon responses to this notice is solely within the discretion of the Gover be provided which supports both the shield and detector system. 10) The system provided must be able to operate for years at constant counting efficiency without the need for factory repairs. 11) The vendor must provide on-site assistance for the installation of the system. The proposed contract action is for supplies for which the Government intends to solicit and negotiate with only one source under the authority of FAR 6.302-1. Interested parties may identify their interest and capability by submitting a required qualifications statement. However, all proposals (including responses to the qualifications and capabilities statement items listed above) received within forty-five days after the date of publication of this synopsis will be considered by the Government. Solicitation No 52WCNR506042 will be issued O/A 05/01/95. A determination by the Government not to compete this proposed contract based upon responses to this notice is solely within the discretion of the Government. Information received will normally be considered solely for the purpose of determining whether to conduct a competitive procurement. If no qualified responses are received, the Government intends to contract with Princeton Gamma-Tech, Incorporated, Princeton, New Jersey, which is the only known source for the required services. All responsible sources may submit a bid, proposal or quotation which shall be considered by the agency. Copies of the solicitation will only be provided in response to written or faxed requests received directly from the requestor. Telephone requests will not be honored. Satisfactory receipt of faxed request is the sole responsibility of the sender. Fax number (816) 426-7530. (0107)

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