U.S. Geological Survey, Branch Of Acquisition and Federal Assistance, Box 25046, Denver Federal Center, Denver, CO 80225-0046

66 -- NITON XL 722 PORTABLE XRAY FLUORESCENSE (XRF) SPECTRUM ANALYZER SOL 99CRQQ0274 DUE 082099 POC Marilyn Hutchison, Purchasing Agent, 303-236-5900, x327 or FAX 303-236-2710 E-MAIL: UGS,CR, Acquisitions & Federal Assistance, mhutchi@usgs.gov. The U.S. Geological Survey, Central Region Minerals Team, Denver, Colorado, has a requirement for a Niton XL 722 Portable X-Ray Fluorescense (XRF) Spectrum Analyzer. This instrument must meet the following specifications: A: Principal of Operation: X-ray fluorescence analysis of bulk samples. Simultaneous analysis and display of a minimum of 18 elements. Automatic correction for x-ray interferences, matrix bias, and age of source. User controlled analysis time. B. Radiation Sources: Minimum of 106Cd (half-life 463 days) and 241Am (half-life 433 years) with capability of adding a third source. Sources are to be contained within the instrument and readily user selectable. C. Detectors: Thermo-electrically cooled Si PIN-diode and CdZnTe. Protected by a readily replaceable mylar window (at least 6 replacements included). D: Analysis Area: Minimum of 1 cm x 2 cm. E. Microprocessors: 68HC16, two DSPs. 20,000 internal channel multi-channel analyzer (display at least 1024 channels). F. Memory: Capable of storing at least 1000 spectra with associated analyses and sample descriptions. G. Auto-calibration: Self-calibration prior to testing. No interference from calibration material during analysis. H. Elements to be analyzed and displayed: A minimum of 18 elements, selectable from the following list: Antimony, arsenic, barium, bismuth, cadmium, chromium, cobalt, copper, gold, indium, iodine, iron, lead, manganese, mercury, molybdenum, nickel, palladium, rubidium, selenium, silver, strontium, thallium, thorium, tin, titanium, uranium, zinc, zirconium. I. Performance: 300 eV or better at Mn. Spectrum range from 2 to 90 KeV or better. Results for a minimum of 18 elements with 95% confidence levels. Detection limits of 100 ppm or less for all elements. J. Output: All data must be downloadable to a PC (cables and software (Windows 95 or 98 compatible. This requirement is considered a "Brand Name or Equal" product manufactured by Niton Corporation, Bedford, Massachusetts. Quotations are due on or before August 20, 1999. Interested parties shall complete Request for Quotation No. 99CRQQ0274 at the following website: http://ideasec.usgs.gov/, or contact Marilyn Hutchison at (303) 236-5900, ext. 327, or Fax (303) 236-2710, to obtain a copy of the Request for Quotation Posted 08/05/99 (W-SN363612). (0217)

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